Question

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

Answer 1

Without trees, formerly forested areas would become drier and more prone to extreme droughts. When rain did come, flooding would be disastrous. Massive erosion would impact oceans, smothering coral reefs and other marine habitats.
Hope it helps

Answer 2

Answer:

there is a great effect caused when there is no greenery on Earth .the soil lose it's fertility and the land is convert into desert.and there is no transpiration from the trees used in the process of water cycle.