That study is talking about the US, it's not talking about the world. If the US has done all of this work, and yet climate change is STILL happening and we're dealing with it right now then the US is not the problem.
But why isn't it working? Because China is the biggest polluter
https://world101.cfr.org/global-era-issues/climate-change/who-releases-most-greenhouse-gases
Because Christianity played a major part in helping black people overcome slavery and united them together?
Also all Civil Rights movements in America started in the Protestant Church