It's very plausible that «they» don't implement certain innovations yet, for the sake of being able to directly implement them, off the shelf, when emssion regulations get more demanding. (mechanics.stackexchange.com)
We believe this approach of sharing emssions fairly per capita worldwide, and a process of aligning all nations to that is vital. (treehugger.com)
It is even possible that human cooling influences such as particle emssions and albedo changes from crop growing could offset any human induced warming already. (newclimatemodel.com)