Cynicism is not only the refuge of those who don’t have imagination to change the world, and who usually do nothing. 

It is also a tool from the extreme right to discredit democracy and science. 

People who say “nobody knows if humans are responsible for climate change” are changing the conversation and making people believe there is no definite proof of the connection between human activity and changes in the weather patterns of the world, but there is.

The IPCC (The Intergovernmental Panel on Climate Change) https://www.ipcc.ch has gathered definitive evidence that points to the warming of our planet because of CO2 emissions, which went through the roof after WWII.