Maybe more climate activists will think about the climate change not as an international problem to be resolved in an air-conditioned meeting hall but as a guerilla war to be fought in the streets.

Ever since the collapse of cap and trade legislation and the realization that President Obama is unlikely to ever utter the words 'climate change' in public again much less use the bully pulpit to prepare the nation for the catastrophic risks of inaction the movement has been in a funk.

Climate change is a global issue - from the point of view of the Earth's climate a molecule of CO2 emitted in Bejing is the same as a molecule emitted in Sydney.

If you are interested enough in the climate crisis to read this post, you probably know that 2 degrees Centigrade of warming (or 3.6 degrees Fahrenheit) is the widely acknowledged threshold for "dangerous" climate change.

Geoengineering - the deliberate large-scale manipulation of the earth's climate to offset global warming - is a nightmare fix for climate change.

Among all the tests President Obama faced in his first term his biggest failure was climate change.

Bill Gates is a relative newcomer to the fight against global warming but he's already shifting the debate over climate change.

Some people call it global warming some people call it climate change. What is the difference?

Doing all we can to combat climate change comes with numerous benefits from reducing pollution and associated health care costs to strengthening and diversifying the economy by shifting to renewable energy among other measures.

The damage that climate change is causing and that will get worse if we fail to act goes beyond the hundreds of thousands of lives homes and businesses lost ecosystems destroyed species driven to extinction infrastructure smashed and people inconvenienced.

Some argue that now isn't the time to push the green agenda - that all efforts should be on preventing a serious recession. That is a false choice. It fails to recognise that climate change and our carbon reliance is part of problem - high fuel prices and food shortages due to poor crop yields compound today's financial difficulties.

As far as I'm aware everybody in the shadow cabinet accepts that there's a compelling case on climate change and a strong scientific case.

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.

There are plenty of problems in the world and doubtless climate change - or whatever the currently voguish phrase for it all is - certainly is one of them. But it's low on my list.

Often times when you face such an overwhelming challenge as global climate change it can be somewhat daunting - it's kind of like trying to lose weight which I know something about.