To help the environment, the environmental components (land, water and air) should be protected from pollution. Human activities most of the time generate waste, but the environment can be protected/helped by engaging in proper waste management techniques.

Also their is the need for us as humans to come to the understanding of the importance of vegetation in our environment.
Human existence rely primarily on plants/vegetation in our environment, from where food, clothing and even the air we breath in is produced by plants.
The environment can be helped by planting vegetations (flowers, trees and greens generally.
They help to absorb toxic gases from the atmosphere, they help to screen odor from the environment, they help to prevent land erosion to mention but a few of the functions and importance of vegetation in helping the environment.