If you were asking about removing something harmful from the Earth, then here's some information about pollution and nuclear weapons.
-Pollution
*Air pollution
Harms human health and the environment. It can cause acid rain, which kills trees and affects water bodies. It can also harm wildlife and agriculture.
*Hazardous waste
Exposure to improper e-waste disposal can cause debilitating and fatal illnesses.
Exposure to chemicals
Exposure to lead and other chemicals can cause debilitating and fatal illnesses.
-Nuclear weapons
Some people have suggested removing nuclear weapons from the Earth for the sake of all of its inhabitants.
Effects of pollution
*Air pollution can reduce visibility and block sunlight.
*Air pollution can harm forests, wildlife, and agriculture.
*Greenhouse gas pollution, the cause of climate change, affects the entire planet.
Animals are also affected, experiencing health problems like birth defects and reproductive failure.