I think it's unfair to consider CO2 emissions on a country by country basis since each and every person on this planet is responsible for their own actions. Such figures don't consider population sizes.
Why is that relevant?
In 2003 the average UK citizen emitted over 2 times more CO2 than the average Chinese citizen. Now which countries are the problem?
Still China, becuase they have a huge population, and thus, are a huge issue.
Consider a very basic example.
Country A has one person living it in it, who emits lets say 100kg c02 per year. Thats a lot. Country B is far more frugal, its population emit 10kg c02 per year. But Country B has 100 people living in it.
Which is the bigger threat to the world?
Yes, Country B, irrespective of the glutteny of the single population of Country A.
We are a small country, therefore, our actions do not make much, if any, difference to the world situation. This is a selfish view, yes, but it's also pretty much spot on. The bigger your population the bigger contribution your country makes to the situation.
And China has a HUGE population. It's per capita figure is also skewed by billions of people living in poverty and not even having a donkey ride let alone a car.
Surely China will say Europe aren't trying very hard so we won't either?
Almost certainly. But if we all make an effort, China will find another excuse. Why? Becuase they are going through what we went through 150 years ago. They will, perhaps quite rightly, ask why they cannot industrialise on a mass scale when we were allowed to 150 years ago. People in China want a Western lifestyle. They want cars too. They want lots of electricity as well.
THIS is the problem. Not the guy down the road with an X5.