What are the possilbe colutions to reducing/removing CO2 concentrations in the atmosphere?

Answer 1

Stop cutting down trees/plant more trees, reduce CO2 emissions by humans (e.g. alternative transportation and car pooling), put scrubbers in smoke stacks (they 'clean' emissions given off by factories).

The only thing about trying to mandate factory use of scrubbers is that they are expensive. And many people don't have the money or resources to go out and buy new reduced-emission cars.

Answer 2

like they said, stop cutting down the trees, stop spreading the amount of coal and other fossil fuel burning plants and for GOD SAKE! stop worrying about money more than you environment!