The pace of warming may be far too fast for animals, humans or ecosystems to adjust.

But it does not require preventive programs for entire ecosystems with all their species.

It is well known for its small, perennial lake and adjoining ecosystems.

However, introducing goldfish has often had negative consequences for local ecosystems.

But the same assurance, many scientists say, cannot be given for natural ecosystems.

Oyster bed were an important resource for marine habitat and ecosystems.

As currently planned, the arboretum will be developed over 20 years, with nearly 85 percent of the site set aside for natural ecosystems.

That question, which may have different answers for different ecosystems, is still to be investigated.

The Department of Defense has issued management plans for various ecosystems on this territory.

It is important to support increased investment in research into the consequences of the fisheries policy for fish stocks, ecosystems and biodiversity.