Maybe it is more complex to deal with the causes of CO2 emissions. Some places in the world like Africa, East Asian have numerous power plants emitting tons of CO2 to the air and there are no simple substitutes to them because of lack of budget. Also if simply enforce those countries to ban factories would cause a rising of unemployment.

Reining in emissions and fixing our society are not separate issues. The scale of the change needed to substantially reduce or eliminate CO2 and methane emissions is huge.

Simple doesn't mean easy, unfortunately. There's more than a few sources of CO2 emissions, and some of the significant ones arent even (directly) manmade.

You're talking clathrates?

Volcanoes emit CO2