Several studies I've seen show China (27.2%) , US (14.6%), and India (6.8%) at one, two, and three in annual CO2 emissions. The US was no.1 up until about 15 years ago, when China blew by us, a large part of which was due to US manufacturing corporations moving to China, where labor and pollution control costs are lower. So now, they are polluting over there instead of here. But, we are all in the same boat. Though the US population is much smaller than China's and India's, many people in the US enjoy a higher standard of living. We all drive cars, travel by air, and in general, consume a lot of everything, all of which leads to more CO2 emissions. The average American contributes more than twice the carbon emissions of the average Indian and Chinese person combined. And China and India are running massive programs to deal with pollution, whereas Trump is ignoring the climate crisis and doing everything to roll back US environmental regulations.

I certainly hope we can develop technological solutions to the climate crisis, but it won't happen unless enough people wake up and push for action by our governments. That's where the activists come in - they are waking up people. We need the cooperation of our governments because it will cost big and require new legislation. The climate scientists have defined what needs to be done - we need to reduce our carbon emissions. And engineers and technicians are developing solutions. To see which country has been contributing the most to climate change, see the link. https://www.weforum.org/agenda/2019/01/how-each-country-s-share-of-global-co2-emissions-changes-over-time/