PEOPLE MUST USE THEIR OWN CARS TO PREVENT THE AIR POLLUTION.

WE HAVE TO KEEP THE ENVIRONMENT CLEAN.

PEOPLE MUST USE PUBLIC TRANSPORTATION.

WE HAVE TO RECYCLE WASTE MATERIALS.

PEOPLE DON'T HAVE TO SAVE ENERGY.

WE MUSTN'T USE RENEWABLE ENERGY SOURCES.

WE MUST HUNT THE WILD ANIMALS.

PEOPLE DON'T HAVE TO USE FOSSIL FUELS.

WE MUST WASTE WATER.

WE MUSTN'T USE ECO-FRIENDLY PRODUCTS.

PEOPLE MUSTN'T USE CHEMICAL SUBSTANCES IN AGRICULTURE.

THROWING GARBAGE INTO THE SEAS, LAKES AND RIVERS CAUSES WATER POLLUTION.

GLOBAL WARMING IS THE INCREASE IN TEMPERATURE OF THE EARTH.

WE MUSTN'T REUSE, REDUCE AND RECYCLE TO PROTECT THE ENVIRONMENT.

SHOULD WE SORT OUT OUR GARBAGE?

SOLAR ENERGY AND WIND ENERGY ARE HARMFUL FOR THE ENVIRONMENT.

PEOPLE MUST DISTURB THE BALANCE OF THE NATURE EVEN MORE.

GLACIERS ARE MELTING BECAUSE OF GLOBAL WARMING.

WE MUST TAKE NECESSARY PRECAUTIONS TO SAVE THE NATURE.

HUMANS THREATEN THE BALANCE OF THE NATURE.

SHOULD WE TURN OFF THE LIGHTS WHEN WE DON'T USE THEM?

SHOULD PEOPLE BE AWARE OF THE ENVIRONMENTAL PROBLEMS?

ARE GREENHOUSE GASES, EXHAUST FUMES AND FOSSIL FUELS USEFUL FOR THE ENVIRONMENT?

TICK THE WORDS BAD FOR THE ENVIRONMENT.