A measurement of the amount of carbon-dioxide a person adds to the atmosphere

To use less or make something smaller

To not allow something (eg. smoking, alcohol, plastic bags, protest marches, etc.)

Animals, birds, insects, etc. living naturally in the wild

To destroy a forest by cutting down all the treess

To travel from home to work and back

A thick dirty cloud at ground level caused by pollutants reacting to sunlight

To put waste in the wrong place (eg. put toxic waste into a river)

To get rid of something you don't want

Carrying harmful bacteria or toxins that can cause disease or death

To make something new from materials that have been used before

higher air and sea temperatures partly caused by man-made increases in greenhouse-gas levels

Forms of energy that can be replaced naturally, such as hydro-electricity, solar energy and wind power

To release or project something (eg. light, sound, smoke, gas, radiation, etc.)

To give money or goods to an organization you want to help or support

to keep something in its original state

To release waste substances into the air, water and soil

Dangerous substances that need careful disposal (eg. toxic or nuclear waste)

A poor nation that's gradually becoming richer and more advanced