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Emission of Greenhouse Gases Particularly CO2

Emission of greenhouse gases (see also Appendix A on Global Warming) leading to gradual but certain warming of the global environment is a particularly salient environmental problem with grave implications. Measurements made worldwide clearly indicate that average global temperatures have been on the rise since the industrial revolution. The temperature has correlated particularly well with the CO2 concentrations in the atmosphere over that period of time, suggesting that the burning of fossil fuels played a key role in the phenomenon. In 2001, the United Nations Intergovernmental Panel on Climate Change (IPCC) concluded that most of the warming observed over the last 50 years is attributable to human activities, particularly to the burning of fossil fuels. There is some disagreement within the scientific community on related issues such as the nature of the exact correlation between CO2 levels and the global average temperature or the effectiveness of various climatic models. But,...

Greenhouse Films

Currently, the low-density polyethylene (LDPE) homopolymer and the ethylene-vinyl acetate (EVA) copolymers are the most common plastics materials used for greenhouse cover films applications 4 . However, in Japan, plasticized (PVC) is used to a larger extent. The growing importance of plastics films for greenhouse covers is best illustrated by a few figures with greenhouse films worldwide was approximately 60,000 ha 1 . In 1980 the surface area covered with worldwide greenhouse films was 80,000 ha 1 and reached 220,000 ha in the 1990s 2 . Spain went through a tremendous evolution for the agricultural surface-covered greenhouse from 15,000 ha in 1983 3 to an area of 28,000 ha in the 1990s 2 . Although there is some leveling off in the total area covered with greenhouses in southern Europe, the development is likely to continue in other parts of the world, particularly in South America. The main types of polyethylene films used as greenhouse covers include the following

First Phase Use of Foreign Serine PI Genes

Mean larval weight being decreased by nearly 50 in plants expressing CpTI at approx. 0.5 of total soluble protein in the leaves,37 although little effect on larval survival was observed and plant damage was also little reduced (Fig. 2.3). A better example is the use of this gene to protect strawbery against damage by vine weevil Otiorhynchus sulcatus, which is the major pest of strawbery in Europe, where it is endemic. The larvae damage root systems resulting in severe loss of yield or plant death, and recent reports suggest that damage is no longer confined to the root systems but is also occurring on the vegetative tissues. Since the withdrawal of persistent organochlorines, at least in parts of Europe, the control of adults and larvae has become difficult as few of the currently available products are effective under field conditions and no genetic resistance in commercial germplasm has been identified. The CpTI construct described above has been inserted into strawbery cultivars...

Characteristics and Performance of Coextruded and Blended Films

Coextruded greenhouse films based on two- and three-layer structures are generally made from LDPE, LLDPE, and EVA copolymers. Table 5.1 Characteristics and Performance of Polymers and Their Blends Used for Greenhouse Films Table 5.1 Characteristics and Performance of Polymers and Their Blends Used for Greenhouse Films

Stabilization of Polyolefin Pipes

Pipes are made by extrusion processing of polyolefin. Fittings are made by injection-molding process. Pipes used in irrigation of greenhouses and field watering are exposed to extreme outdoor weather. Since then pipes are meant to draw lifetime of 2-3 years or more, therefore, they need to have appropriate stabilization.

Protoplast Isolation for Several Dicotyledonous Plants

Grow plants in the greenhouse or growth chamber (see Note 1). Usually they can be used until they reach the flowering stage, or as long as they have young, expanding leaves. Harvest young leaves and transfer them to protoplast buffer. 1. Grow rice plants in pots in a greenhouse until they show maximal tillering (see Note 8), which is approx 50 d after sowing. 1. Harvest the young basal part of fresh leaves (approx two-thirds of the leaf) from greenhouse plants (see Note 15), and cut the leaves into approx 5-cm long pieces using scissors. Do not take leaves that are infected with fungi or virus (see Note 16).

Planet on the Brink

It is clear that the levels of carbon dioxide and oxygen have changed dramatically during the Phanerozoic (the last 530 million years), and these changes may themselves have been trivial compared to the longer but less readily sampled Precambrian interval of time. The ecological effects of these changes are very poorly understood. During the Paleozoic Era, CO2 values 20 times that of the present day are now confidently inferred to have been present in the lower Paleozoic, followed by a rapid decline in the Permo-Carboniferous time. The world then underwent a massive glaciation, as its greenhouse conditions gave way to far cooler climates.

New Account of the Moons Origin

If the Earth's formation could be replayed 100 times, how many times would it have such a large moon If the great impactor had resulted in a retrograde orbit, it would have decayed. It has been suggested that this may have happened for Venus and may explain that planet's slow rotation and lack of any moon. If the great impact had occurred at a later stage in Earth's formation, the higher mass and gravity of the planet would not have allowed enough mass to be ejected to form a large moon. If the impact had occurred earlier, much of the debris would have been lost to space, and the resulting moon would have been too small to stabilize the obliquity of Earth's spin axis. If the giant impact had not occurred at all, the Earth might have retained a much higher inventory of water, carbon, and nitrogen, perhaps leading to a Runaway Greenhouse atmosphere.

Giants Influence When the Planets Formed

Following the discovery that Martian meteorites arrive at Earth at a rate of half a dozen each year, some investigators have suggested that Mars played a role in seeding Earth with life. The reasoning is that Mars is tougher than Earth to sterilize globally. Ironically, this aspect of habitability is caused by the lack of a Martian ocean. During the first half-billion years of the history of the solar system, during what is called the period of heavy bombardment, the terrestrial planets were hit by projectiles larger than 100 kilometers in diameter. On Earth, impacts of such magnitude vaporized part of the ocean, and heat from the impact and the resulting greenhouse effect could warm the entire surface of the planet to sterilization temperature. On Mars, with no ocean, such an impact could cause great regional damage but would not sterilize the whole planet. With its thin atmosphere, surface heating would also be more rapidly radiated into space. The low total abundance of water on...

Seeking Lifes Spectral Signature

Observation of ozone, CO2, and H2O in the atmosphere of an unknown planet strongly suggests habitable conditions and the presence of life. Water vapor at moderate levels can indicate that a planet is essentially in the habitable zone of a star. Water vapor abundance depends on the temperature of an atmosphere as well as on the availability of surface water. CO2 abundance also provides a clue to the habitability of a terrestrial planet. At least on Earth, the ability to keep this dangerous greenhouse gas locked in sediments requires moderate surface temperatures and an active land-ocean weathering cycle, whereby excess CO2 can be sequestered in carbonates and thus kept out of the atmosphere. The strengths of the CO2 and H2O absorptions provide

Future Research Needs

Clearly there is scope for further work on PI-expressing plants and pollinating insects, in the development of both laboratory-based tests with different dosages of PIs and field- or glasshouse-based tests with the plants themselves. This research will make a valuable contribution to the formulation of meaningful protocols for testing particular

Tests of the Theories

Hastatulus, a dioecious, wind-pollinated, weedy colonizer of disturbed sites, which is known to show substantial variation in individual life span from annual, to biennial, to short-lived perennial (Radford et al, 1968). For the field experiment, the objective was to grow the plants under the same local conditions under which selection had been acting and had shaped the life history. The observed mortality pattern would then be an accurate assessment of natural field mortality. For this experiment, 646 three-week old seedlings were planted into the field, 20 cm apart, and except for an initial mowing, immediately prior to planting, the natural vegetation was undisturbed. For the experiment in the greenhouse, the objective was to grow plants under idealized conditions and to increase the proportion of individuals in the population living to late ages. To do this, there were two treatments. In the first, undisturbed census treatment, 637 plants were grown in individual pots, and watered...

Oxygen Release By Roots Into Rhizosphere Of Helophytes

Gas exchange at the appropriate parts of the root system not only causes the oxygenation of the rhizosphere but also enables the flux of gases from the rhizosphere together with gases generated inside the plant tissues to the atmosphere by internal diffusion and or ventilation. Although this exchange has been investigated for ethylene, carbon dioxide and methane, for example 90-92 , information about nitrogen generated by denitrification inside the rhizosphere is still lacking. The processes involved depend on the species 83, 93-100 . In connection with the gas exchange, determining the phytohormone ethylene as a marker for plant-physiology studies is of particular interest 52, 92, 101-108 . Carbon dioxide may be generated by microbial mineralization in the soil or be derived from respiration in underground tissues of the plants 95, 109 and can also be fixed in photosynthesis by the plants 110 . Because of the role of methane as a greenhouse gas - after all, up to 90 of methane...

Plants Can Be Classified by Their Photoperiodic Responses

Day Neutral Plants Examples

This hypothesis was shown to be incorrect by the work of Wightman Garner and Henry Allard, conducted in the 1920s at the U.S. Department of Agriculture laboratories in Beltsville, Maryland. They found that a mutant variety of tobacco, Maryland Mammoth, grew profusely to about 5 m in height but failed to flower in the prevailing conditions of summer (Figure 24.17). However, the plants flowered in the greenhouse during the winter under natural light conditions. FIGURE 24.17 Maryland Mammoth mutant of tobacco (right) compared to wild-type tobacco (left). Both plants were grown during summer in the greenhouse. (University of Wisconsin graduate students used for scale.) (Photo courtesy of R. Amasino.) FIGURE 24.17 Maryland Mammoth mutant of tobacco (right) compared to wild-type tobacco (left). Both plants were grown during summer in the greenhouse. (University of Wisconsin graduate students used for scale.) (Photo courtesy of R. Amasino.)

Plants Roots and the Soil

Anemia Plant Diagramatic Daigr

Soils has been re-ignited with the current debate over sequestration of C by vegetation in an attempt to mitigate the greenhouse effect induced by rising CO2 concentration of the atmosphere. For example, observations of deep-rooted grasses introduced into the grasslands of South America have demonstrated that they can sequester substantial amounts of carbon (100-500 Mt C a-1 at two sites in Colombia) deep in the soil (Fisher et al., 1994). Roots and their associated flora and fauna are the link between the visible parts of plants and the soil, and are the organs through which many of the resources necessary for plant growth must pass. As part of the system that continually cycles nutrients between the plant and the soil, they are subject to both the environmental control of the plant and the assimilatory control of the plant as a whole.

Plate Tectonics as Global Thermostat

Tectonic Thermostat

The maintenance of liquid water is controlled largely by global temperatures, which are a by-product of the greenhouse gas volumes of a planet's atmosphere. The temperature of Earth's (and of any planet's surface) is a function of several factors. The first is related to the energy coming from its sun. The second is a function of how much of that energy is absorbed by the planet (some might be reflected into space, and this relationship is dictated by a planet's reflectivity, or albedo). The third is related to the volume of greenhouse gases maintained in a planet's atmosphere. Greenhouse gases have a residence time in any atmosphere and are eventually broken down or undergo a change in phase. If their supplies are not constantly replenished, the planet in question (such as Earth) will grow colder gradually until the freezing temperature of water is reached, at which point it will grow colder rapidly (as we have noted, when a planet starts accumulating ice, its...

Stabilization of Polymers

Low-molecular-weight HALS has almost no effect, except in impact-modified PVC in which HALS in combination with a benzotriazole-type UV absorber outperforms UV absorbers used alone in the same concentration. In TiO2-pigmented impact-modified PVC, HALS is much more effective than UV absorbers. In transparent plasticized PVC films used in greenhouses, stabilization by HALS is comparable to that of the benzophenone- and benzotriazole-type UV absorbers. However, the best performance is obtained with the combination of HALS and a UV absorber.

Materials And Methods

Immature inflorescences of Poaceae and Typhaceae were harvested while unemerged and still covered by leaf sheaths. For Cyperaceae and Juncaceae, inflorescences were gathered while the flowers were small early in their development. The explants were surface sterilized by dilute bleach solution then cultured on primary explant medium DM-8 in the dark at 26-28oC. DM-8 medium 10 contained (in mg l-1, unless indicated otherwise) Murashige and Skoog (MS) salts 11 , Sigma Fine Chemicals) 4,300 Miller's salt solution 6 (w v) KH2PO4 , 3 ml myo-inositol, 100 Vitamix 12 , 2 ml sucrose, 30,000 supplemented with the plant growth regulators adenine hemisulfate, 400 vM picloram, 0.12 indole-3-butyric acid, 1 2,4-dichlorophenoxyacetic acid, 0.5 isopentenyladenine, 0.5 trans-zeatin, 0.5 thidiazuron (TDZ) 3.0 and solidified with Phytagel (Sigma Fine Chemicals), 2000. The secondary medium (0201) contained fewer plant growth regulators at reduced levels 0.2 2,4-D and 0.1 vM TDZ 8 . The tertiary, shoot...

Photoperiod Effects

Autumnal senescence occurs at a time of decreasing day length, and therefore, short days (SDs) would be expected to cause leaf senescence shedding in trees and herbaceous plants if they are photoperiodic. In many, but apparently not all species, autumnal senescence is induced by SDs (Matzke, 1936 Jester and Kramer, 1939 Ashby, 1950 Olmstead, 1951 Krizek et al., 1966). Interestingly, street lights delay leaf senescence and shedding in many tree species (Matzke, 1936). The effect of this night interruption tends to be greater close to the light source and more pronounced in areas with milder winters (Larry Nooden, personal observations). Under continuous days in a glasshouse, some leaves on red maple saplings lasted almost 2 years, far beyond their natural longevity (Jester and Kramer, 1939). Since SDs with interrupted nights behave like long day (LD) photoperiods, the SD-photoperiod effects are not due simply to light dosage (Ashby, 1951 Krizek et al., 1966).

Insect Responses to Dietary Serine PIs

Serine Proteinase

Protection of strawbery plants expressing the trypsin inhibitor from cowpea (CpTI) against larvae ofvine weevil (Otiorhyncus sulcatus). The plant on the left is a transgenic strawbery expressing CpTI the plant on the right is a control. Both plants were exposed to vine weevil larvae in a glasshouse trial. (Photo courtesy of Julie Graham, Scottish Crop Research Institute, Invergowrie, Dundee, Scotland.) Fig. 2.4. Protection of strawbery plants expressing the trypsin inhibitor from cowpea (CpTI) against larvae ofvine weevil (Otiorhyncus sulcatus). The plant on the left is a transgenic strawbery expressing CpTI the plant on the right is a control. Both plants were exposed to vine weevil larvae in a glasshouse trial. (Photo courtesy of Julie Graham, Scottish Crop Research Institute, Invergowrie, Dundee, Scotland.)

Forensic Field Studies

While conventional wisdom may dictate a progression from bench to greenhouse to field-testing of remedial technologies, there are distinct advantages to starting directly in the field to examine the rhizoremediation capabilities of natural vegetation. This approach affords a view of the long-term impacts of a diverse array of plant species, including mature trees, on microbial communities and or contaminant disappearance otherwise inaccessible due to the practical time limitations of most planted studies. Forensic studies are also invaluable as a means of screening species for their ability to prosper in contaminated soil and under environmental stresses (i.e. drought and nutrient stress) without active cultivation. However, the numerous abiotic heterogeneities and lack of controlled conditions at natural field sites can make determinations of true rhizoremediation effects challenging.

Habitable Zones of the Universe

Runaway and moist greenhouse atmospheres and the evolution of Earth and Venus. Icarus 74 472-494. Sagan, C., and Chyba, C. 1997. The early faint sun paradox Organic shielding of ultraviolet-labile greenhouse gases. Science 276 1217-1221. Sagan, C., and Chyba, C. 1997. The early faint sun paradox Organic shielding of ultraviolet-labile greenhouse gases. Science 276 1217-1221.

Stabilization Of Plastics

Polymeric films used in greenhouse and mulch film applications have been a subject of great interest to additive manufacturers, film processors, and researchers for over 25 years 29-34 . 2. Ni quenchers first compounds used for greenhouse stabilization in combination with UV absorbers Ciba has currently produced two new Tinuvin products Tinuvin 492 and Tin-uvin 494. These structures have lower basicity as compared to original hindered amines 31, 35 . Great Lakes Chemicals has added two new HALS, UVASIL 816 and UVASIL 299 (HALS2). These are tertiary HALS that provide higher performance in greenhouse films and greater resistance to pesticide spraying. Tinuvin 123 is particularly designed to give sulfur resistance in rose greenhouses.

Appendix A Global Warming

The surface temperature of earth is determined by the rate at which solar radiation reaches the planet, the surface albedo, and the rate of emission of infrared radiation by the earth into the atmosphere. The earth's atmosphere contains low levels of the so called greenhouse gases such as carbon dioxide and water vapor, that allow the incoming solar radiation to reach the earth unhindered but trap some of the heat radiated back from earth into the atmosphere49. In this regard, the greenhouse gases act similar to glass in a greenhouse, trapping the long wavelength infrared radiation from escaping the earth. Figure A.1 indicates the fate of solar radiation entering the earth's atmosphere. For the most part this greenhouse effect is a natural process indispensable to life on earth if not for the biogenic greenhouse gases in our atmosphere the temperature of earth will be inhospitable (colder by about 33 C). However, increasing concentrations of carbon dioxide and other greenhouse gases...

Effect on Crops

A large volume of information has been published on the climate forcing and global warming. The scope of this volume does not permit a comprehensive discussion of this interesting topic. The various reports of the IPCC (2001) 11 will provide a good starting point for readers interested in a more detailed study of global warming. The Panel in their latest report identified the most effective short-term mitigation strategy to be limiting the emission of greenhouse gases. Stabilization of atmospheric CO2 concentrations at even 450 ppm would require the global anthropogenic CO2 emissions to drop below year 1990 levels within a few decades, and continue to decrease steadily thereafter to a small fraction of current emissions.

Humidity

The moisture in contact with the greenhouse films can have combined effects of unique physical properties with its chemical reactivity 27 . The water in contact with polymers may have three kinds of effects that may contribute to degradative reactions (i) hydrolysis of labile bonds, such as those of polyesters or polyamides (ii) physical destruction of the bonds between polymer and a filler, resulting in chalking or fiber bloom rain may wash away water-soluble degradation products and additives moisture, can contribute to swelling of certain plastics, and (iii) photochemical effect, in solving the generation of hydroxyl radicals or other reactive species that can lead to promotion of free-radical reactions 27, 28 . In order to assess the role of various weather parameters on the degradation of plastics, it is critical to have accurate climatological data corresponding to the exposure sites.

Conclusions

Ultimately, the position of starch and other plant carbohydrates as green, greenhouse-neutral replacements for petrochemicals offers great potential for the farming of crops containing specialized storage products. In addition to nonfood uses, applications ranging from fat substitutes to fiber (as resistant starch ) in novel foods promise to create new markets for plant carbohydrates and new demand for their creation. At present, however, the rejection by the public of genetic engineering in general, widespread in Europe and growing in North America and elsewhere despite the environmental benefits it can bring to agriculture, is discouraging growth in the production of transgenic carbohydrates. It remains to be seen whether modified starch and carbohydrates produced in transgenic plants but destined for nonfood products can escape such pressures.

The Problem

The disposal of municipal solid wastes (MSW) has traditionally been via landfills (about 83 of the waste generated) since the method is most convenient. Some of the gases released by this method e.g., greenhouse gases and volatile organic compounds (VOCs) are high and unacceptable. In addition the odors released into the environment are unacceptable. Other methods for waste disposal include incineration (6 ) and recycling (11 ) 24, 25 . The most common practice for the disposal of MSW has been landfill. The landfill disposal, therefore, creates the problem of odor, generation of toxic and other gases (e.g., methane and carbon dioxide), and intrusion of leachate generated from landfill site into soil and groundwater 26 . With the land prices continuously escalating and land becoming scarce, this method is unsatisfactory in addition to the environmental needs. As for the thermal destruction, special interest in air toxic organic pollutants and trace metals emission from incinerators...

Age days

Survivorship curves (log percent) for R. hastatulus field (triangles) and undisturbed greenhouse (circles) populations. was very low only 9 of the undisturbed treatment plants were still alive post-flowering (day 525). Clearly, the developmental shift from vegetative to reproductive growth results in an increase in mortality. This may be an example of a pleiotropic trade-off between reproduction and survival, but the genetic correlations between these traits could not be measured with this experimental design. The mean life span in the undisturbed treatment in the greenhouse was 444 259 days. There were no differences in mean life span for male and female plants that survived to flower. The survival curves (Fig. 23-1) clearly show that, as predicted by Medawar, a larger proportion of the population in the greenhouse survived to later ages than in the field. Despite the fact that survivorship curves have traditionally been used in plant demography studies, it is in fact...

Expression Systems

We are using rice as an expression system to evaluate the biological activity of select human milk proteins. To date, we have expressed lactoferrin, lysozyme and -antitrypsin at very high levels, and large-scale field trials for several generations show that the transgenic rice is stable, expression levels are similar through generations, and the proteins are only expressed in the seeds. The genes were synthesized using codon optimization 22 , i.e. the GC (guanine-cytosine) content was increased by nucleotide substitution but without changing any amino acid residue. Sequencing of the recombinant proteins confirmed that the amino acid sequence was identical to that of the native proteins. The signal sequence coding for storage was used. The gene was inserted by the so-called 'gene gun' technique and calli were grown in culture. Positive plants, detected by extraction and Western blots, were grown in greenhouses to obtain mature seeds. Seeds positive for the recombinant protein were...

Y ye ee eoeo yje214

In practice, it is easier to make the measurements needed to test Equation 21.4 on tissue rather than on single cells. Therefore, Gardner and Ehlig (1965) used tissue leaves of cotton (Gossypium hirsutum L.), bell pepper (Capsicum frutescens L.), sunflower (Helianthus annuus L.), and birdsfoot trefoil (Lotus corniculatus L.) . The plants were grown in a greenhouse. To obtain different values of water potential, they withheld water from the plants until their leaves wilted to the desired extent. Water potential and osmotic potential were determined with thermocouple psychrometers. The relative water content was determined by using the method of Barrs and Weatherley (1962).

Wilting Point

The method of determining permanent wilting point is as follows (Taylor and Ashcroft, 1972, p. 303). An indicator plant, usually sunflower (Helianthus annuus), is put in 500 grams of soil in a metal can. The plant grows and is given adequate moisture until the third pair of true leaves is formed. Then the top of the can is sealed with wax. The sunflower grows in a greenhouse or outdoors until it wilts. Then it is transferred to a dark, humid chamber for recovery. If the plant recovers, it is put out again. The procedure is repeated until the plant remains wilted overnight (24 hours) in

Mulch Films

Cantaloupe, tomato, pepper, cucumber, squash, eggplant, watermelon, and okra are high-value vegetable crops that show significant increases in yield and or fruit quality when grown on plastic mulch. Other crops such as sweet corn, snap bean, and southern pea show similar responses. It promotes yield of maize grown under greenhouses to be 2.4 tons per hectare more than the plants grown conventionally 46, 47 . Table 5.8 shows the major advantages and disadvantages of a number of films.

Planted Studies

When designing planted studies, as with any controlled experiment, careful and statistically conscious design is critical to ensure conclusive results. Replicates of each treatment including unplanted soil as a control should be included. Numbers of replicates should be as high as reasonably achievable without compromising the quality of the data since higher numbers of replicates produce more accurate results and a lower likelihood of producing false positive negative results. Randomised arrangements of treatments, whether in pots or field plots, should be employed to ensure that differences observed are due to treatments rather than variations in light, soil composition, moisture, etc. associated with different locations in a greenhouse or outdoor area. Additional guidance may be found in books focusing on basic statistics 22 and experimental design 23 . The following sections discuss additional design considerations specific to pot or field plot studies. Performing studies in...

Lignins

Reduction of CCoAOMT alone in transgenic tobacco plants resulted in a decreased lignin content but a simultaneous reduction in CCoAOMT and COMT activities induced a further reduction in lignin content, confirming that both enzymes are indeed involved in methylation reactions in lignin biosynthesis (7). Surprisingly, although the transgenic plants showed a 40 to 60 reduction in lignin content, they appeared to grow normally under greenhouse conditions even though they exhibited a deformation of vessel elements. These results have been partly confirmed by M. Legrand's group in Strasbourg (France) (personal communication) on the same material. However, in addition to a reduction in lignin content, CCoAOMT down-regulation induced a decreased growth rate and a dramatic disorganization of vascular tissues (reduction of xylem thickness, reduction of vessel diameter). These discrepancies concerning the growth of the plants have not yet been explained. W. Boerjan et al. (personal...

Escape

As we saw in Chapter 2, a planet's average temperature is greatly affected by the volumes of greenhouse gases in its atmosphere. Much of this gas enters a planet's atmosphere from actively erupting volcanoes. Although there are abundant volcanic eruptions in the sea as well, most of the carbon dioxide from these events does not make its way into the atmosphere. Cold seawater can hold large amounts of dissolved carbon dioxide, and below 700 meters, CO2 will settle to the bottom of the ocean as it reaches saturation in the water. At the time of Snowball Earth, enough CO2 would eventually reach the atmosphere to melt back the sea ice and, in so doing, expose the metal-rich waters of the sea to the atmosphere. The time necessary for this melt-back has been estimated by Hoffman and his group to be between 4 and 30 million years. With the ice melted back from the sea, and temperatures again warming, Earth would have undergone spectacular changes. Here is how Kirschvink has described these...

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Building Your Own Greenhouse

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