Grass has always played an important role in the global ecosystem.

At the same time, the world's reliance on fossil fuels is changing Earth's climate and threatening to devastate the global ecosystem.

In terms of the global ecosystem, there is a free lunch and its name is photosynthesis.

His repeated, bottom-line philosophy is: the global ecosystem should be managed for the benefit, broadly conceived, of human beings.

Specifically identified as a stress to the global ecosystem is the rising population.

The desired effect is an emotional response to the human impact on the global ecosystem.

The first is that the global ecosystem is in serious trouble and needs help.

It is our stupidity which impacts on global ecosystems.

But global ecosystems have survived much greater impacts than the temporary disease they caught after the industrial revolution.

Significant changes like the salinization of water push species to new locations, directly impacting global ecosystems.