I believe we should reframe our response to climate change as an imperative for growth rather than merely being a way of being green or meeting environmental commitments.

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

It's coming home to roost over the next 50 years or so. It's not just climate change it's sheer space places to grow food for this enormous horde. Either we limit our population growth or the natural world will do it for us and the natural world is doing it for us right now.

There is no question that climate change is happening the only arguable point is what part humans are playing in it.

All cities do face similar significant trends in the future... most importantly global warming and climate change.

Climate change was a point of division between Obama and Republican rival Mitt Romney. The president declared climate change a global threat acknowledged that the actions of humanity were deepening the crisis and pledged to do something about it if elected.

Our economic system run for profit and waste and based primarily on the extractive industries is the cause of climate change. We have wasted the earth's treasure and we can no longer exploit it cheaply.

Those who visit foreign nations but associate only with their own country-men change their climate but not their customs. They see new meridians but the same men and with heads as empty as their pockets return home with traveled bodies but untravelled minds.

Men may change their climate but they cannot change their nature. A man that goes out a fool cannot ride or sail himself into common sense.

As human beings we are vulnerable to confusing the unprecedented with the improbable. In our everyday experience if something has never happened before we are generally safe in assuming it is not going to happen in the future but the exceptions can kill you and climate change is one of those exceptions.