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In 1950 to 1952 the first climate change report emerged.
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The increase in Co2 was the main cause, from there the people dont used the car too much.
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The people from NASA used to studied about global warming and the goverment don't used to pay attention to them.
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In China due to population growth the citizens used to have no more babies, because overpopulation was another cause of global warming.
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People used to take public transportation.
The people from beach used to pick up trash.
The manufacturing companies used to pollute the environment; now they are friendly to the environment.