A new kind of ___ supposed to make corn grow twice as fast.

___ occurs as a result of the introduction of substances, such as chlorofluorocarbons and halons, into the atmosphere.

It turns out that the health of a modern individual can be damaged not just by the consumption of junk food, but even by a strict selection of exclusively high-quality, enviro-safe ___ food.

Marine ___ energy sources (seaweed) are crucial alternatives for sustainable development.

And then the car itself just ___ to absolutely nothing.

A layer of scraps, leaves, some fertiliser, seaweed - a perfect ___!

___ is the process by which a radioactive substance changes to a different form.

It's an ___ animal species, an ecological tragedy.

A billion don't have clean ___ water.

The gradual rise in the Earth’s temperature is known as ___.

to recycle

to reduce

to pollute

to drop litter

to rot away

to rust away

to pile up

to break down

decay

to dump

disposal