You ask “If the USA is actually looking good in terms of cutting its ‘official’ CO2 figures, why else is it opposing these agreements?” The answer is in the detail of the Paris accords which require the USA to fund (bribe)Third World countries to remain “low carbon economies”, poor, in other words.
“The main effect of Paris would be to transfer American wealth to Third World nations under the guise of global climate policy. Secondarily, it singles out the United States for punitive additional carbon dioxide reductions when we already lead the world in reducing carbon dioxide emissions.”
As Larry points out, the Coal fired Power Stations in China and India have no Catalytic Convertors to remove Sulphuric and Nitrous oxides, and no filters to remove soot and ash from their smokestacks: that is why the air quality is so low there.
If the USA is guilty of exporting pollution to China along with its jobs, then Europe and the rest of the Western world are just as guilty: most CO2 reductions in the West have been more than matched by even greater CO2 increases in the East, just without any of the air-cleaning technology we take for granted in the West. The Global Warming, Climate Change Action crowd are responsible for the greatest increase in air pollution in the history of the world.