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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.

There are more effective ways of tackling environmental problems including global warming, proliferation of plastics, urban sprawl, and the loss of biodiversity than by treaties, top-down regulations, and other approaches offered by big governments and their dependents.

Climate change is a terrible problem, and it absolutely needs to be solved. It deserves to be a huge priority.

I have long understood that climate change is not only an environmental issue - it is a humanitarian, economic, health, and justice issue as well.

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

The fight against global warming is a humanitarian issue - how the planet can be preserved - and it is also an issue of considerable economic importance, of what we call green growth.

Despite widely differing perspectives and agendas, there seems to be a remarkable global consensus that has built up over a fairly short period of time that climate change and ecology is one of the truly defining issues for humanity.

Climate change is transforming the world in profound ways that continue to evolve.

In my personal belief, the big problem with climate change is getting people to understand the magnitude and scale that we're dealing with. If you buy a vehicle that gets 35 miles to the gallon, that means nothing; it's not enough. We need to make changes across society and in every piece of the energy pie.

We have to face the reality of climate change. It is arguably the biggest threat we are facing today.