ecosystems

However, a further increase in farming area without impacting unfavourably on what remains of the world's natural ecosystems appears unlikely.

A further expansion of farming area will adversely impact on the world's natural ecosystems

As such, they are key species for understanding and predicting impacts of global change on Antarctic and sub-Antarctic marine ecosystems.

Because if we aren't, we won't be providing much value in future ecosystems, and that may put in question the foundation for our existence.

But today's report is the starkest warning yet of the potentially devastating impact of climate change and human exploitation on the Antarctic's delicate ecosystems.

Companies that have long focused on hardware now have to think of ecosystems instead to give consumers practical solutions to their everyday problems.

From the standpoint of a traditional educator, this outcome indicated that schooling had failed to help students think about ecosystems and extinction, major scientific ideas.

It is home to one of the world's finest marine ecosystems,with more than 1,300 species of fish and 700 species of coral.

Managing ecosystems sustainably is more profitable than exploiting them, according to the millennium Ecosystem Assessment.

migrating birds affect ecosystems both at home and at their winter destinations, and disrupting the traditional routes could have unexpected side effects.

Penguins are sensitive indicators of changes in marine ecosystems.

Penguins, like other seabirds and marine mammals, occupy higher levels in the food chain and they are what we call bio-indicators of their ecosystems.

The millennium Ecosystem Assessment, a vast four-year global study which reported its initial conclusions earlier this year, found reasons to believe that managing ecosystems sustainably—working with nature rather than against it—might be less profitable

By connecting directly with customers, and by responding quickly to changes in the markets as well as in the ecosystems (生态系统), small farmers can keep one step ahead of the big guys.

It is the rules governing food webs of the ecosystems.

Mathematical models have also revealed that food webs may be unstable, where small changes of top predators can lead to big effects throughout entire ecosystems.

Prevention is key, scientists says because once ecosystems pass their tipping point, it is remarkably difficult for them to return.

This view is especially evident on kilimanjaro as climbers go through five ecosystems in the space of a few kilometers.

Uncontrolled human activities greatly upset ecosystems.

They did not always prioritize the protection of Mauna Kea's fragile ecosystems or its holiness to the islands'inhabitants.