Declamation Or debate on is man responsible For global warming (time limit two minutes)
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The debate on climate change originally started in 1858, around the time of the Industrial Revolution. Since then, people have been suggesting that global warming is caused by human behavior on the one hand, and natural processes on the other. But who is right?
In the 20th century alone, the global temperature rose by 1.4F. In 2013, some 11,000 peer reviewed studies concluded that 97% of research found that global warming is caused by humans. A 2012 study concluded that 70% of climate change after 1850 is part of multiple solar cycles. In 2013, however, a study showed that the rate of global warming over the past century was faster than it has ever been over the last 11,300 years. Finally, in 2010, a study demonstrated that the last major glaciation (not warming) period happened between 460 and 445 million years ago. Carbon dioxide levels then where five times what they are now.
In the 20th century alone, the global temperature rose by 1.4F. In 2013, some 11,000 peer reviewed studies concluded that 97% of research found that global warming is caused by humans. A 2012 study concluded that 70% of climate change after 1850 is part of multiple solar cycles. In 2013, however, a study showed that the rate of global warming over the past century was faster than it has ever been over the last 11,300 years. Finally, in 2010, a study demonstrated that the last major glaciation (not warming) period happened between 460 and 445 million years ago. Carbon dioxide levels then where five times what they are now.
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