to stop someone or something from being killed, injured, or destroyed

waste material or things that are no longer wanted or needed

to make an area or substance, usually air, water, or soil, dirty or harmful to people, animals, and plants, especially by adding harmful chemicals

the grey, black, or white mixture of gas and very small pieces of carbon that is produced when something burns

a living thing that grows in earth or in water

small pieces of rubbish that have been left lying on the ground in public places

the air, water, and land in or on which people, animals, and plants live

to harm or spoil something

a thick liquid that comes from petroleum, used as a fuel and for making parts of machines move easily

a container for waste

a liquid obtained from petroleum, used especially as a fuel for cars and other vehicles

the number of vehicles moving along roads, or the amount of aircraft, trains, or ships moving along a route