Improvements in design may reduce ecological damage but will never prevent it entirely.

It is unknown if they have caused any ecological damage.

Both would cause massive ecological damage to the areas in question.

No significant long-term ecological damage is believed to have occurred.

"He always looks for the solution of least ecological damage."

When I think of all the ecological damage that these things must cause ?

The planned projects will be designed to avoid ecological damage.

They want my opinion on the short- and long-term ecological damage.

In recent years illegal mining has caused ecological damages to the river.

However, the beneficial effects were not significant and the ecological damage was great.