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Moreover, the new concepts of ecological optimization criterion and finite time availability are presented.

同时，还介绍了生态学优化准则及有限时间可用性等新概念。

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The world will regret having spent so much time debating global warming while the real ecological threat, access to cheap safe water, becomes obvious.

FORBES: Twenty Trends For The 2010s

Perhaps now is the time for me to consider a more formal return to ecological study?

BBC: By Hugh Warwick

To be sure you are marking a fundamental change in human society borders on the impossible--such events happen just a few times a century, and (barring things like ecological collapse) rarely with anyone's ability to see at the time that anything has changed.

FORBES