the number and types of plants and animals that exist in a particular area

the way the Earth's weather is changing

the result of a particular action or situation, especially a bad result

when all tress in a large area are cut down

a long period when there is no rain and people do not have enough water

when gas, heat, light, etc. is sent out into the air, or an amount of gas, heat, light, etc. that is sent out

when soil, stone, etc. is gradually damaged and removed by the sea, rain or wind

a large amount of water covering an area that is usually dry

fuels such as gas, coal and oil that were formed underground from plant and animal remains millions of years ago

a large mass of ice that moves very slowly, usually down a slope or valley

a gradual increase in world temperatures caused by polluting gases

a gas that causes the greenhouse effect, especially carbon dioxide

when cows or other animals graze, they eat grass.

to cause something to be under the surface of water, or to move below the surface of water

farming that provides enough food for the farmer and their family to live on but not enough for them to sell

happening once every year, or relating to a period of one year

a part of a building or piece of land used for a particular purpose

to make something happen, especially something bad

something that is difficult and that tests someone's ability or determination

a period of ten years, especially a period such as 1860 to 1869, or 1990 to 1999

the result of a particular influence

the air, land and water where people, animals and plants live

a subject or problem which people are thinking and talking about

to say that an event or action will happen in the future, especially as a result of knowledge or experience

a general development or change in a situation or in the way that people are behaving