exhaust fumes - TOXIC GASES EXPELLED BY CARS. , global warming - THE RISE IN TEMPERATURE CAUSED BY GASES IN THE ATMOSPHERE. , endangered animals - ANIMALS WHICH ARE IN DANGER OF BECOMING EXTINCT. , green house effect - THE PROCESS BY WHICH THE EARTH IS HEATED WHEN THE ATMOSPHERE TRAPS HEAT FROM THE SUN. , Acid rain - POLLUTED WATER FALLING FROM THE CLOUDS. , Aerosol spray - A TYPE OF SPRAY CONTAINING PRESSURIZED LIQUID. , rain forest - A DENSE FOREST IN A TROPICAL REGION. , ozone layer - IT PROTECTS US FROM THE SUN’S ULTRAVIOLET RADIATION. , Energy - THE POWER THAT COMES FROM COAL, ELECTRICITY, GAS, ETC. THAT IS USED FOR PRODUCING HEAT. , deforestation - CUTTING DOWN TREES OVER A LARGE AREA. , recycle - PUT USED OBJECTS AND MATERIALS THROUGH A PROCESS SO THAT THEY CAN BE USED AGAIN. , environmentalist  - A PERSON WHO WANTS TO PROTECT THE ENVIRONMENT. , pesticide - A CHEMICAL SUBSTANCE THAT IS USED FOR KILLING ANIMALS, ESPECIALLY INSECTS THAT EAT FOOD CROPS. , water contamination - ADD A CHEMICAL SUBSTANCE WHICH WILL MAKE THE WATER DIRTY OR HARMFUL., planet - A LARGE BODY IN SPACE THAT MOVES AROUND THE SUN.,

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