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What may be the reasons for these changes?

What is the biggest cause of extinction currently?

What is a good way to preserve biodiversity?

Which country supports almost 10% of biodiversity on Earth?

Why is action now being taken to preserve biodiversity?

What can pollution do to an ecosystem?

What can an increase in the standard of living lead to?

What would happen if more of these materials are properly handled?

In which ways can pollution occur?

What is the main cause of air pollution?