It would appear that the general public has spoken, to those who voice the impending doom to humans causing climate change ( ie climate change ). The lack of any discussion in the political campaign seems to indicate, the seers impending doom are rightly ignored.

The earth has been through climate changes through it's ~4.5B year life, without the help of humans.. 

The questions are:
  If humans are causing change, what percentage change are they causing , above normal variations?

What physical evidence is there to show humans are causing, at least some change?

While there is a connection between environmental & climate change, such as deforestation, the magnitude has yet to be determined.

One of the surprising developments is the increased CO2 has contributed to the "greening" of some arid & semi-arid areas of the globe.