CO2
It has been my understanding that the Green movement is to remove as much carbon dioxide from the air as possible. No, make that remove humans adding more CO2 to the air as possible.
One step is moving to electric cars which will help but is not without expensive problems. Another biggie is making cement but there are some promising although expensive developments on that front.
 
Then an article in TIME Magazine warns of a CO2 shortage. What?
There are “factories” in the US that make CO2, not as a byproduct of manufacture, CO2 as the product.
Also Jackson Dome, an extinct volcano in Mississippi, where they drill carbon dioxide wells.
Why?
Breweries, especially small craft brewers to carbonate the beer and push it from keg to tap. Soda pop too.
CO2 helps rapidly chill frozen food, it makes dry ice, and for humanely slaughtering animals.
There’s a whole lot of CO2ing going on.