Give me one example of that, just one, and then I will try to give you an answer.
If you had been paying any sincere attention to climate scientists, then you would be aware that "global warming" is not a simple phenomenon. Overall, gradually, over the course of many years, temperatures on Earth are indeed rising on average, and the statistics back that up. In general, we can expect more extreme weather. That includes hotter summers, and colder winters... and more tornadoes, floods, and extreme weather conditions.
This is not some simplistic scenario where temperatures are simply going up. Meterology is a complex science, one that experts cannot hope to predict with infallibility. I would recommend learning more about climate science. If you want to trash it, then at least do it from the perspective of someone who is well informed about it.