Which gas do trees absorb from the atmosphere and help reduce?

Save our trees and forests!

By what logic is carbon dioxide gas which feeds plant life considered a harmful gas. Both oxygen and carbon dioxide gases are essential for all living things on our planet.

If trees inhaled helium would they sound funny ????

Clay, As with most things it is beneficial in moderation. Too much is harmful.

If one has to burn something for heat, cooking etc it is much better to burn wood (as opposed to coal or oil) because it only releases the CO2 that it has absorbed in its lifetime.

At night they absorb oxygen. At night CO2. But overall more CO2.