More unnoticeable is the gradual climatic change that can damage our health. In the last two decades the predominance of asthma in the United States has quadrupled, in part because of climate-related factors. For islanders, respiratory irritants come in dust clouds that originate from Africa's expanding deserts.Another reason for this aggravation is because of the increased levels of plant pollen. With double the ambient level of carbon dioxide, plants can produce up to 60% more pollen.
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