In other words planting trees and reducing these harmful activities would help the earth heal faster? We as humans have to assist as well.Well if you allowed it to heal on its own it might really take a very long time like hundreds of years as I am thinking, these impurities are carbon dioxide on the best way to heal it is to plants trees that can take in this carbon dioxide and give us more oxygen.. this will reduce the rate of carbon dioxide in the atmosphere.. burning of fuel, goal and industrial activities release so much of this into the atmosphere.