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Last Updated: Thursday June 30 2005 14:49 GMT

Natural disasters

In parts of Africa, there has not been enough rain in recent years.

This has caused big shortages of food.

Bit when it does rain, this can cause floods that also destroy crops.

Some countries also have tornadoes, hailstorms and even frost.

The effects of these extreme weather conditions are called natural disasters.

What's to blame?

Most scientists say they're actually the result of things that people have done.

They blame pollution from cars and factories for what they call global warming - a rise in the Earth's temperature.

Africa now produces eight times more carbon dioxide - one of the gases that leads to global warming - than it did 50 years ago.

But the rest of the world is still responsible for 97% of it.

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