He writes both fiction and science essays on the modern problems of ecology.

It is a pertinent question in connection with many modern problems.

Can existing institutions be used to cope with modern problems?

This is not, in any event, only a modern problem.

Until a few years ago, it was the modern "problem with no name".

He said that such study would prepare students to look beyond themselves in dealing with modern problems, like a world threatened by pollution.

It was time to start discussing modern problems, he said.

He has attributed many modern social problems to what he calls the "cultural left".

In each instance, I shall refer to an important modern problem of government that calls for a democratic response.

Desertification is not a modern problem; it has been with us for decades.