Although the unemployment problem can't be ignored, the environment problem is also very important.

That paper of his deal with environmental problems.

We ought to be more interested in environmental issues.

I know a lot about environmental problems.

We insist that during the next three days you make decisions which are fair to all generations and which show an active concern for the environment.

Environmental problems call for quick action.

The environment was the focus of student council activities.

Many European people are aware of environmental problems.