Fill in the gaps.
There are thousands of endangered plant and animal __species_ in the world.
Global _warming__ is caused by a phenomenon known as the greenhouse effect.
The three forms of _fossil__ fuel are oil, natural gas and coal.
Greenhouse _gases__ trap heat in the atmosphere, which makes the Earth warmer.
The Antarctic _ozone__ hole was discovered in 1985.
Each molecule of __carbon_ dioxide consists of one atom of carbon and two atoms of oxygen.
Switching to ___ energy-saving light bulbs is the easiest way to start saving energy.
When we burn fossil fuels, this releases all sorts of gases into the air causing air pollution such as smog.
Climate _change__ is one of the biggest threats we face today.
We cannot see or feel __UV__ radiation, but our skin responds to it by turning darker.
