Decades of global scientific research, using multiple models, shows without a doubt, that we are causing global warming.
It really, really, really doesn't. I'm not a climate change denier, in fact I have a 30 year history of serious environmental activism. But in the last few years I've actually started to read the scientific papers and the surveys of scientists and have realised that we are constantly been shown the absolute worst case scenario, taken from poorly gathered data, as if it was a sure thing. We are constantly being told that there is scientific consensus, when no such consensus exists.
The main actual consensus is that we have nowhere near enough accurate data or time spent on climatology to have any genuine clue what effect human activity is having on the global climate. It's a field of science in it's very real infancy and we are not a point where we can make anything close to accurate predictions. Any scientist claiming to know for a fact what is happening, is bullshitting. All that exist are theories, early theories, not even true scientific theories. Because, far, far, far too much is still unknown.
It doesn't mean that we aren't causing damage to the environment. Because we are and a lot of changes in the technologies we use need to be made. We are an extremely polluting species and that has very real consequences. We have to get better and until we do, people and other living things will suffer the consequences. But, by focussing on the unknown as if we actually know. By lying about things we can't possibly know. What happens is that we ignore real issues due to looking at a 'bigger picture' that possibly doesn't exist.