The world is only coming to understand other environmental problems.

If there are environmental problems, we say give us hard evidence.

In that story we can see the Catch-22 of so many environmental problems.

You can understand why there is no longer such a thing as a local environmental problem.

It is a good report on a very serious environmental problem.

This was a perfect environmental problem for the Administration, they said.

In the last decade, environmental problems have become more important.

Because of the great pressure to use its resources it shows serious environmental problems.

Finally, I would draw your attention to an environmental problem.

Sometimes, it seems that this is the only environmental problem.