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If I could still remember that highschool geology lesson I had back then in Highschool, global warming is caused by that CO2 emission(actually not just carbon dioxide) on our air. CO2 qand ojther harmfull gases do not allow sun's heat to escape from the earth's atmosphere after hitting it.
On some countries such as Japan; some of their buildings there have garden's purposely put up at the roof to increaser the presence of oxygen on the area. I've seen it on TV and it is such a very unique idea.
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