Really?
You think the CO2 levels, that are historically at an all-time high, and completely unprecedented, and correlate directly with the use of oil and coal over the last 150 years are not mostly caused by humans?
The evidence is literally overwhelming.
http://climate.nasa.gov/evidence/
http://sealevel.colorado.edu/content/data-processing-methods
I mean, there are thousands of well sourced, well studied papers outining the impact humans have on the current and future climate.
Meanwhile, on the other side, we have self-citing articles and "opinion pieces" claiming its all a hoax.
https://www.friendsofscience.org/index.php?id=3
https://www.amazon.com/Man-Made-Global-Warming-Richard-Huseman/dp/0984152512
Every reputable organization reports manmade climate change as fact and something we need to take seriously. Most of the worlds leaders and leading scientists have provided proof and evidence. The dissenting opinions spend more time arguing semantics than providing proof.