to conserve

(a)  

to pollute

(a)  

to control

(a)  

to take care of

(a)  

to stop (doing something)

(a)  

to develop

(a)  

to discover

(a)  

to destroy

(a)  

to be affected (by)

(a)  

to be polluted

(a)  

to avoid

(a)  

to improve

(a)  

to protect

(a)  

to recycle

(a)  

to pick up

(a)  

to reduce

(a)  

to resolve; to solve

(a)  

to breathe

(a)  

(made) of aluminum

(a)  

(made) of plastic

(a)  

(made) of glass

(a)  

pure

(a)  

renewable

(a)  

global warming

(a)  

climate change

(a)  

conservation

(a)  

air pollution

(a)  

pollution

(a)  

water pollution

(a)  

deforestation

(a)  

ecology

(a)  

ecologist (male)

(a)  

ecologist (female)

(a)  

solar energy

(a)  

nuclear energy

(a)  

container

(a)  

extinction

(a)  

factory

(a)  

government

(a)  

(tin) can

(a)  

law

(a)  

environment

(a)  

danger

(a)  

population

(a)  

over population

(a)  

recycling

(a)  

natural resource

(a)  

solution

(a)