Question

no world without trees why?
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Answer 1

FILTHY AIR:

Without trees, humans would not be able survive because the air would be unsuitable for breathing. ... Trees are a crucial part of the carbon cycle, a global process in which carbon dioxide constantly circulates through the atmosphere into organism and back again.

Answer 2

Answer:

If trees wouldn't be there on the earth then, the level of oxygen will decrease and carbon dioxide coming from vehicles and other harmful activities will increase. Nothing would be there to stop clouds resulting in no rain.