It is about the damaging effects of climate change and other environmental problems affecting the planet.

VOA: special.2009.05.08

We could try to change it in a way that keeps much of the spirit of the personality theory, but avoids some of the problems we've just been looking at.

我们可以试着保留人格理论的精髓，但避开它给我们带来的问题。

耶鲁公开课 - 死亡课程节选

Floods,droughts,pollution and climate change have created even more problems.

VOA: special.2010.04.05

WHO Chief Margaret Chan says such problems will be magnified under climate change.

VOA: standard.2010.01.02

This is the first global conference that aims to tackle the problems that result from climate change and devise strategies to help nations adapt to these changes.

VOA: standard.2009.08.31

"President Obama embodies the new spirit of dialogue and engagement on the world's biggest problems: climate change, nuclear disarmament and a wide range of peace and security challenges,".

VOA: standard.2009.10.09