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The U.S. has fallen well behind Europe in recognizing climate change and the implications of climate change.

Climate change is very real.

Climate change is real.

Climate change is a really abstract thing in most of the world.

The effects of climate change are real and must be acted on.

In the case of climate change, the threat is long-term and diffuse and requires broad international action for the benefit of people decades in the future. And in politics, the urgent always trumps the important, and that is what makes it a very difficult and challenging issue.

Global climate change has a profound impact on the survival and development of mankind. It is a major challenge facing all countries.

Climate change is also clearly a matter of huge interest and concern for the scientific community.

On climate change, we have only a handful of years to make massive changes, according to the scientists. The politicians have to act, and only the people can make them, because Royal Dutch Shell's not going to do it.

Many countries - as well as cities, states and provinces - are taking global warming seriously and are working to reduce emissions and shift to cleaner energy sources.