There is an enormous amount of evidence for global warming. I don't have to investigate the deniers. They are all right wingers who believe this is a political issue. It is not. Rising CO2, melting glaciers and melting ice caps have no political affiliation.
The ice caps have always been and always will be either expanding or receding. They have never been nor will they ever be static. If our beliefs are correct, there have been times during which life flourished on this planet and there were no ice caps at all. Now they've been receding from some interval that is an instant in the context of geological time scales. Ice caps receding does not infer that humankind is the cause of generally rising temperatures over a period any more than ice caps expanding would prove humankind is causing generally falling temperatures.
I interpret what I'm seeing as, "The ice caps have been generally receding recently so we have to do X." The problem is that nobody really knows what effect doing X will have. Nobody knows that doing X will have any effect on the "behavior" of the ice caps at all. And if there would be an effect, nobody knows what the magnitude will be. There are people who are creating the impression that they know, but they don't.
And the global warmists are asking for some pretty significant Xs. I think they'd be much better off being honest about the level of certainty associated with their assertions and taking the "just in case" approach. In other words, they should be doing something like noting that we're going to have to move away from fossil fuels sooner or later anyway and saying it
could be that there could be some serious consequences if we don't go ahead and do it now.
Instead, they're
basically saying they
know it's going to be a disaster for our species if we don't take draconian measures right now and that's dishonest.