• Acid rain is created by some nations and affects others.
• Land is being polluted by chemicals.
• The ozone layer is thinning due to pollution of the air. This increases the risk of cancer for people and animals.
• Toxic waste produced by industry is often dumped on developing countries.
• Accidents involving dangerous chemicals and nuclear materials affect people, land, sea and air. Most of humanity's waste ends in the oceans, often without any processing.
• Rivers flow through different countries, passing pollution on.
• Humans have been hunting animals to extinction for at least 25 thousand years, but now, as the forests are burnt and rivers and lakes are polluted, so animals and plants are becoming extinct by sheer carelessness.

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