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It is generally believed that climate change is caused by human activities .

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One possibility is that the brain always does something so that it is in an active state when quick thoughts or reactions are needed .

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Secondly , many elderly people are proud of being able to look after themselves and would feel shame to be looked after by anyone else , even close family members.

Conceivably , increasing pollution not only causes serious problems such as global warming but also could threaten to end human life on our planet .