It is always good to hear dissenting opinions. Few believe climate change do not exist, some that it does exist but is not man made, again some that it exists and is man made but not that serious.
However, there is a clear consensus among scientists and world governments:
http://climate.nasa.gov/evidence/
http://www.un.org/climatechange/
http://www3.epa.gov/climatechange/
http://ec.europa.eu/clima/policies/eccp/index_en.htm
Major business now take climate change into accounts when making projections and risks assessment.
http://www.chevron.com/globalissues/climatechange/
http://www.wsj.com/articles/exxon-mobil-gets-subpoena-from-n-y-regarding-climate-change-research-1446760684
http://www.goldmansachs.com/our-thinking/pages/harnessing-the-markets.html


30-minute presentation by Ivar Giaever, 01 July 2015
https://www.youtube.com/watch?v=TCy_UOjEir0
If you are an Alarmist - DO NOT WATCH!!
You might be forced to think.