The Earth's global climate does change naturally, but over hundreds of thousands of years and primarily due to periodic variations in Earth's orbit. The dramatic increase in average global temperatures that we are experiencing has no known precedent. The only factor that can account for the temperature change is the increase in greenhouse gas emissions, mostly CO2 from the combustion of fossil fuels.

Climate change is a complex subject once you dive into the actual details. But the evidence is clear cut. For a simple, compelling analysis that confirms global warming read the following. It begins with the assumption that global warming is a fraud! Then it demolishes that hypothesis by comparing the number of record hot temperatures to the number of record cold temperatures. If global warming is fake, those numbers should be equal. They aren't ---

http://www.blastr.com/2017-3-8/if-we-assume-global-warming-hoax-what-should-we-expect-see