I believe in global warming. Is it a problem the size they make of it? Hell no. Are we reponsible for it? Partly yes. Should we do something about it? We can give it a try but it won't make any difference.
I'll explain myself a bit.
Yes, the globe is warming. We can measure that and indeed temperature globally is rising. It would be stupid to deny that. Is it a problem? It is, one way or another, some species might die. Is it a hugh problem? No it's not. Reason: we are only measuring temperature since 1830 and since then it never has been globally warmer then now. Scientology however can see on rocks for example that the earth has been warmer millions of years ago. And then there is also the fact that we are going to a new ice age, so this warming is just a temporary thing.
We are partly responsible however, we speed up things by small particles we blow in the air, by gasses and so on. But problem there is, we can't change it because it's our economy. So the ideal sollution would be to decrease the amount of people on the planet. Question then is, how are we going to do that? We're at 7 billion now and the prognoses are that we will be with 10 billion by 2050. So what can we do? We can, each personally, try to avoid to speed up the warming process, but it won't work, unless every single one of us is responsible enough to participate. I am already, daily... Now only the rest will have to follow.