After the war, plans to continue the A 5 to the north were abandoned for ecological reasons.

So, in addition to ecological, cultural and other scientific reasons to keep them alive, they are historic sites of highest rank.

Now even this is banned in many areas for ecological reasons.

In 1995 the transmission power had to be reduced for ecological reasons.

The three-mile-long wall was being built purely for "economic and ecological reasons."

It has thus far proven too expensive to colonize the world; and there are ecological reasons not to do so.

Pets should not be released into the wild for humane, legal, and ecological reasons.

They are also used in forests for ecological reasons.

A few years ago, for both financial and ecological reasons, the company decided that 270 acres of lawn was just much too much.

But we also need to take this step for ecological reasons, of course.