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I think any thinking person should be worried about climate change.

I'm not as convinced as a lot of people are that man-made climate change is the threat they think it is.

If we do not change our negative habits toward climate change, we can count on worldwide disruptions in food production, resulting in mass migration, refugee crises and increased conflict over scarce natural resources like water and farm land. This is a recipe for major security problems.

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

We need to start by having a conversation about climate change. It would be irresponsible to avoid the issue just because it's uncomfortable to talk about.

Politicians or pundits can distort or cherry-pick climate science any way they want to try and gain temporary influence with the public. But any serious industrialist who's facing 'climate exposure' - as it's now called by money managers - cannot afford to engage in that sort of self-delusion.

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.

One thing we do know about the threat of climate change is that the cost of adjustment only grows the longer it's left unaddressed.

Climate change - for so long an abstract concern for an academic few - is no longer so abstract. Even the Bush administration's Climate Change Science Programme reports 'clear evidence of human influences on the climate system.'

I think global warming is the gravest threat. With global warming, it's the product of a war between old energy - between the carbon cronies, who, by the way, could not stay in business in a true free market capitalism.