
They are important as all plants give us _____.
We need them not just because it helps with the _____.
Dropping _____ on the ground is not just a lazy thing to do.
The best waste is _____ waste, like dead leaves, carrot tops, onion skins and so on: all rot down and make fertile soil.
_____ material leaking out would be a very serious problem, as it can cause extreme damage not only to the soil but also to the population.
When rivers and seas are polluted by waste we are not only stealing their beauty and spoiling it for ourselves too. Sadly accidents do occur; _____ slicks sometimes happen and wreck the environment.
The _____ protects us from harmful ultraviolet rays, that could penetrate through the Earth's atmosphere.
There wasn't so much _____ on items you bought either.
The trouble is: not everything can be _____ or will naturally degrade.
_____ used to contain them.
They are also a home to many animals who rely on them for their _____.
_____ is another serious problem which is damaging the plants and is caused by pollutants such as sulphur dioxide and nitrogen oxides.
_____ has been the cause of controversy over the years.
The rainforests have been slowly _____ for a while now.
This in turn will help the plants and _____ giving them much needed food.
Many centuries ago, the Earth had way less problems caused by _____ with things made of plastic.
But now, with almost everything being sold with a lot of _____ wrapping, we are suffering the consequences of far too much waste.
The hole in the ozone layer has been caused by chlorofluorocarbons (CFC's), a _____ that was found in some everyday products you probably even use without realizing.
The fact that paper can be recycled and is easy to dispose is great, but remember paper is made from trees, which are important to the _____.
These come from the burning of _____, oil and gas.