whats the fastest way to prevent climate change or global warming?

I really do not know if there is a fast way to do such. We have been abusing the world that we live in for quite a time and the effect is slowly creating this. It cannot be done by a single person alone as you have said. It requires the cooperation of everyone. Sad to note that very few people have this in mind and most of us take it for granted. If only everyone will do their part, even in small ways then there is a chance. But as of now, I do not see any. We will continue to suffer and eventually it will lead to destruction later on.