Not only China and India emit much less CO2 per capita, the US has emitted far more CO2 than any other country accumulatively. The US has been industrialized fo

Not only China and India emit much less CO2 per capita, the US has emitted far more CO2 than any other country accumulatively. The US has been industrialized for more than one hundred years and had been the No1 emitter of CO2 for more than a century until very recently. All these CO2 accumulated in the atmosphere has not been cleaned up yet. True we should all use cleaner energy sources. Planting one billion tree is a step towards a greener environment.