Part 1

There most certainly IS a consensus of 97% of the Scientific Community on the dangers of climate change and global warming. 
 
 There are seven scientists who studied/co-authored a Paper that Analyzed the climate consensus question.  They stated:
1) Depending on exactly how you measure the expert consensus, it's somewhere between 90%-100% that agree humans are responsible of climate change, with most of our studies finding 97% consensus among publishing climate scientists.
2) The greater the climate expertise among those surveyed, the higher the consensus on human-caused global warming.

They refute the findings of scientists from the "Petition Project"--who engaged in a misinformation campaign to deny the existence of the expert consensus.  

The Consensus Project--CONSENSUS ON CONSENSUS--John Cook, Naomi Oreskes, Peter Doran, William Anderegg, Bart Verheggen, Ed Maibach, J. Stuart Carlton pub. 2016.