It is undeniable that climate change is human caused and real. The polar ice caps are melting more and more every year. Global warming doesn't just make the world warmer, it causes weather to become unbalanced and more extreme. This gives the impression to some people that Global Warming doesn't exist because it is "cold". Science has again and again shown and proven that Climate Change at this scale is human caused, and denying its existence is only narrowing our chance to solve the problem.

I agree that climate change is caused by humans. Ever since the introduction of fossil fuels during the industrial revolution atmospheric CO2 levels have risen substantially. In fact,  it just surpassed 400 parts per million, which is the highest it has been in over 800,000 years. This strongly correlates to human activity and there are numerous events tying human activity to climate change. Some of the largest being fossil fuel combustion, which leads to black carbon, that rests on polar ice caps decreasing its reflection rate and speeding up the melting process only making the earth warm faster. Not to mention the fact that about 30% of incoming sunlight is reflected back into space by ice and clouds, the rest is absorbed by the land, ocean and atmosphere. As the rocks air and sea warm, they begin to radiate heat energy, and when that energy reaches the atmosphere it is absorbed by greenhouse gasses the biggest being Carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) all of which are byproducts if fossil fuel combustion. When these molecules absorb the heat th ey become like heaters and radiate the heat in every direction. The energy that radiates back to earth helps to heat the lower atmosphere which enhances the heating received from direct sunlight (this information was found on the NASA website).