I believe we emit around 15 to 25Gt (IIRC) of CO2 a year
…and the rest. Defra data for 2006 states UK emitted about 500Gt of CO2.
I don't know what to believe…convincing arguments come from both camps, whether it be sun spots, solar flares or fossil fuel burning. In the last couple of years global temperatures have decreased. However, none of this is important.
What is important is that we all do our bit to act responsibly. So what if climate change isn't caused by us, we now know how to go about industry and our domestic lives in an environmentally better way. Surely adopting these new technologies can only be a good thing and if it does make a difference to the climate then there's a bonus.