Heat stress in the northern latitudes where the populations are not acclimatized would be the primary health impact of warming . Serious illness and increased mortality is indicated in some regions (including some urban areas in the US) with a high degree of air pollution. Asthmatics and those with respiratory difficulty will be particularly affected by heat stress. An equally serious concern will be the prevalence of vector-borne disease  likely to be encouraged by global warming. These include malaria, schistosomiasis, dengue fever, yellow fever, and the African sleeping sickness. The reach of malaria, for instance, could extend from about 45% of the world population at the present time to as much as 60%, as a result of the projected warming. Developing countries, some of them unfortunately in low-lying areas and also susceptible to sea-level rise, will be particularly hard hit by this public health crisis. The major indirect health effects of global warming are likely to be due to overcrowding and migration of large masses of people, and impacts from malnutrition or lack of water from droughts and consequent disruption in agriculture.
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If you suffer with asthma, you will no doubt be familiar with the uncomfortable sensations as your bronchial tubes begin to narrow and your muscles around them start to tighten. A sticky mucus known as phlegm begins to produce and increase within your bronchial tubes and you begin to wheeze, cough and struggle to breathe.