There's been like a maximum global 1 degree celsius change in the last 100 years. If you think that this is vastly different to when we came to be as mammals then you are very mistaken. If the current trend continues then there will be another global increase of 1 degree in the next 100 years. However that's not taking into account future clean and efficient energy sources (eg. fusion) and the ever advancing technology that will allow us to manipulate the weather - which will likely slow things down even more (if even required). We are even already planning to populate Mars - a planet with a vastly different atmosphere to ours. Not to mention you clearly did not read the article I had linked above which states that it is likely the sun that has been the predominant cause of the global warming witnessed in the last ~100 years, not rising CO2 levels.
"you might want to find a dinosaur and ask them what it was like stepping into a world which suited mammals the problem you'll find of course is that - there's none who survived for you to ask"
Also, the prevailing theory is that it was a large comet strike that wiped out the majority of land dwelling dinosaurs.. not the changing climate. The majority of animals simply evolve to become better and more adapted to currect conditions.. or some didn't even have to evolve as conditions have not changed significantly to warrant the evolution (eg. crocodiles)
