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Many of the problems facing the nation and the world today may only be solved if their technical elements are understood - climate change, energy supply, health care, and infrastructure, to name just a few.

Along with issues like global warming, I think a problem with the world today is population decline.

There are plenty of problems in the world, many of them interconnected. But there is no problem which compares with this central, universal problem of saving the human race from extinction.

We have serious challenges regarding climate change, unsustainable use of natural resources, water scarcity, loss of biodiversity, forests and farmland. Not to mention the huge inequality still prevailing in several parts of the planet.

The planet's biggest problems have to do with sustainability, environmental decline, global poverty, disease, conflict and so forth. Really, they're all interconnected - it's one big problem, which is that the way we're doing things can't go on.

Climate change is the Everest of all problems, the thorniest challenge facing humankind.

The saddest fact of climate change - and the chief reason we should be concerned about finding a proper response - is that the countries it will hit hardest are already among the poorest and most long-suffering.

On climate change, we often don't fully appreciate that it is a problem. We think it is a problem waiting to happen.

You look at the large problems that we face - that would be overpopulation, water shortages, global warming and AIDS, I suppose - all of that needs international cooperation to be solved.