I agree with you that we contribute significantly to how much is in the atmosphere and that the changes we make as a result of this will be for the better, economically as well as environmentally. Even if we don't have a big as impact as we think I don't see the harm in changing behaviours/attitudes in order that people have more respect for the way the treat the planet and ultimately one another. Countries already significantly affected by Climate change include Bangladesh, countries in Africa around Lake Chad (aswell as others) and Hait to name a few. On the recycling point, if we can reuse resources surely that is better than constantly making new things which then need a place to be dumped?
The other point I would like to raise about your post, which I have seen a few times around this forum regarding this topic, is the issue of getting warmer weather! Global warming does not mean we will get more Sun! It means the planet is heating up because the Greenhouse Gases trap the heat the Sun gives us (not sure on my science there!), therefore bringing about Climate Chaos (which I believe is a much better term).
The results of this Climate Chaos include flooding (sea level rising because of melting ice caps), spreading of disease (mosiquitos and other carrying beasties being able to live at higher altitudes/new countries due to the global temperature increase), drying out of significant water sources (e.g. Lake Chad - this has ruined countless lives in Africa due to lack of trade/accessible clean water), big storms and more that I can't think of now.
Anyway as you can see this is something that I'm interested in - admittedly only recently so haven't studied a whole heap on the arguments for both sides - which I will in order to gain a balanced view.