Am i on my own thinkig Global Warming IS happening but its NOT mans fault.?

It seems to me there are 2 opposite camps,those who say Global Warming is happenning and its mans fault,and those in denial of GW,so therefore it cant be mans fault.I am pretty convinced GW is happening[and last i know as an Englishman i am free to have an opinion] but i am not convinced it is mans fault,is there any one else who thinks like me.Also i would like to add,even though i dont believe we can stop the earth getting warmer,it cant be a bad idea to stop pumping crap into the atmosphere.