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Climate change is both real and a serious issue

I want to start off by mentioning that this my first debate with another person and this is a very controversial topic and I hope we can both be informative to each other To start I wanted to address your source, in the source one of the first points it makes is that humans are the main cause of global warming, however there actually is a good deal of evidence that humans aren't the main cause, the earth has natural heating and cooling periods and around 1945 people were actually worried about the cooling effect (1) And this isn't without any evidence there is a petition signed by thousands of scientists (2). the general public and many environmentalists believe that since there are charts and graphs it must be true but humans also once wholeheartedly believed the world was flat. It is widely believed and accepted that global warming is causing the ice caps to melt and this will cause "great floods" and whatnot but anyone who knows anything about displacement can obviously tell that's outrageous. Around 400 million years ago during the Ordovician period greenhouse gases were at levels 16 times more than they are at now and the earth was wildly populated with flora and fauna still capable of life.(3) This was brought about by volcanic emissions this can be read about in source 3. SO really the recent rise in carbon emissions inst actually that devastating at all. Also al gores prediction of the melting ice caps due to the carbon emissions is false, according to this (4) in fact it has grown up to 50% larger. the Northern ice cap actually gained area roughly equal to the size of Alaska since 2012. Its silly to say that humans don't make an impact on the environment, and I wont say that because we do have an impact but the earth itself has had much bigger changes in temperature before. to claim that humans are destroying the planet is crazy at most humans will raise the temperature by a couple degrees Celsius. My closing thoughts are that I don't believe global warming is a serious issue the earth has had to deal with much more influential things than humans and ultimately adapts and changes because of it. The U.S. government has spent billions of dollars to fund global warming efforts (5) and this money could be used to fix actual problems that we have identified instead of funding research nearly as heavily as we are. (1)http://www.batteredmen.com... (2) http://www.petitionproject.org... (3)https://en.wikipedia.org... (4)http://www.dailymail.co.uk... (5) http://www.gao.gov...