Let’s say, ten years in the future, a brilliant scientist invents a magic box that drastically reduces some of the biggest inflictors of CO2, and/or even repairs some of the previous damage. Such a marvelous invention would only be valuable in saving the human race if there were simultaneously other improvements on efficiency and CO2 generation to improve the overall reductions.

Movies get us used to one person/initiative saving the world. What’s more practical is a whole bunch of little initiatives - even if each one doesn’t do enough on its own.