Question

what will be the effect caused if all the greenery on earth gets extinct ?​

Answer 1

Explanation:

If we would cut trees what is going to happen is that population won't stop growing but oxygen in the atmosphere will reduce. ... Trees have to breathe to live, same as us and every living thing on the planet. They breathe in carbon dioxide and breathe out oxygen. We breathe out carbon dioxide and breathe in oxygen.

Answer 2

Answer:

If we get rid of all the trees, we will live [on] a planet that might not actually be able to sustain us anymore.”  

For starters, if trees disappeared overnight, so would much of the planet’s biodiversity. Habitat loss is already the primary driver of extinction worldwide, so the destruction of all remaining forests would be “catastrophic” for plants, animals, fungi and more

There would be massive extinctions of all groups of organisms, both locally and globally.”

The wave of extinctions would extend beyond forests, depleting wildlife that depends on single trees and small stands of trees as well.