In three to four sentences explain the role humans can play in the environmental factors that affects a plant's growth?

Humans tend to build things in the environment that shouldn't be there at all because it will affect the living things like animals and plants. Another thing that human causes is pollution, usually when they work in power plants they don't dispose the chemicals property and that can be dangerous to the water and the plants. 

This gel or liquid can be placed under the tongue of an unconscious person. this is important because you should never pour anything down the throat of an unconscious person-- s/he could choke.