THE GREENHOUSE EFFECT: CLIMATE CHANGE
Uneven heating of the world will cause regions that are already arid to become even drier. Central parts of North America, which produces much of the worldÕs grain supply, may also become much drier. Creatures that are adapted to cold climates may have to spread northwards. Animals can do this relatively easily and quickly, but plants which cannot move could be killed by the effects of climate change. Some weeds, however, will thrive on the extra carbon dioxide, though grain, which we need for food, does not. This means that crops will be more difficult to grow and weeds which harm crops, will be far more abundant. Leaf tissue becomes less nutritious with increased carbon dioxide, so crop pests will eat far more.
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