Question

since algae produces more oxygen than trees
why we are told to plant trees only ?​

Answer 1

Plants give gaseous oxygen

I think so

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Answer 2

Answer:

Algae, when used in conjunction with AI-powered bioreactors, is up to 400 times more efficient than a tree at removing CO2 from the atmosphere. ... Algae can consume more carbon dioxide than trees because it can cover more surface area, grow faster, and be more easily controlled by bioreactors, given its relative size.

Hope it helps you.