But plants are also a part of the big picture of Earth's climate and habitability. Well, Arianna, for starters, Earth would be much quieter. Almost all living creatures on our planet depend on plants for food, either directly or indirectly. So if all the plants disappeared, eventually so would almost all the life. Also, Earth would be hotter.
Plants take carbon dioxide out of the atmosphere.
Without plants, the patterns of precipitation would likely be altered. What's more, since plants cover much of Earth's land surface, they decrease the amount of light that our planet reflects back into space. And finally, plants anchor Earth's soil. If the plants were gone, soil would be washed from Earth's surface on a grand scale. Arianna, thanks for your question.