Concern Cause EffectDeforestation 

Population growth and urbanization.

Destruction of natural habitat and loss of ozone layer

Loss of Ozone Layer 

Emitting of chlorofluorocarbons

Earth loses ultraviolet protection from the sun

Greenhouse Effect 

Emitting of carbon dioxide Climate Change

Acid Rain Sulfur emitted into the atmosphere from factories

Destroys forests and biodiversity

Weapons 

Technological and biological revolution

War, and weapons getting into the wrong hands

Hunger 

Population growth, war, and natural disasters

Starvation