The Eden project tries to be _______ with energy, which means that it tries to generate as much of the energy that it uses as possible.

(2) The kettle uses a lot of power; it has a high

Something that can decompose naturally and harmlessly in a reasonably short time is ___________.

Making new products from materials that have already been used is called .

Gases in the atmosphere, especially carbon dioxide, that are causing the Earth's surface to get warmer are known as __________ gases.

__________________ are the gases that are bad for the atmosphere.

Sources of energy based on petroleum, such as gas, coal and oil are _________

A person's/organisation's/country's contribution to greenhouse gases in the atmosphere is their ________ .

... can create nuclear waste, which is bad for the environment.

(2) The decision is not easy, it is a ______________ to make.

(2) Driving less is a good way to

The London Olympic and Paralympic Games will be ________ because they will cause little or no damage to the environment and the benefits will last for a long time.

Energy that is ________ comes from sources that won't run out, like the sun or wind.