How to eliminate C02 emissions that have already been released?

Question

I need some ideas. I've already got planting trees, and CO2 vacuums but I need one more. Thanks in advance.

(Global Warming related)

Answer 1

Cut down old growth trees and plant new trees.

With the cut down trees, lock the carbon in a nice desk or something.

Answer 2

Some people are testing the dumping iron particles to the ocean, which promotes the growth of algae, which absorbs CO2.

Answer 3

The source has some big industrial project ideas.

Answer 4

Algae uses Co2 and waste nitrates from sewage, and can be converted to bio diesel.

Solve several problems at once.