Merchants of Doubt- review

I've attended a community screening of the film, Merchants of Doubt, a movie about climate change. Apparently we're being conned over climate change, but by whom and why?
See here for background: http://hpanwo-tv.blogspot.co.uk/2015/12/climate-change-2015.html.
And: http://hpanwo-tv.blogspot.co.uk/2015/12/happy-christmas-hpanwo-tv-viewers.html.