In any crass political calculation drilling for oil will always win more votes than putting a price on carbon. But if I recall what I was taught in fifth-grade American government class we elect presidents to do more than crass political calculations.

In any crass political calculation drilling for oil will always win more votes than putting a price on carbon. But if I recall what I was taught in fifth-grade American government class we elect presidents to do more than crass political calculations.

With nine degrees of warming computer models project that Australia will look like a disaster movie. Habitats for most vertebrates will vanish. Water supply to the Murray-Darling Basin will fall by half severely curtailing food production.

With nine degrees of warming computer models project that Australia will look like a disaster movie. Habitats for most vertebrates will vanish. Water supply to the Murray-Darling Basin will fall by half severely curtailing food production.

Australia is the only island continent on the planet which means that changes caused by planet-warming pollution – warmer seas which can drive stronger storms and more acidic oceans which wreak havoc on the food chain – are even more deadly here.

Australia is the only island continent on the planet which means that changes caused by planet-warming pollution – warmer seas which can drive stronger storms and more acidic oceans which wreak havoc on the food chain – are even more deadly here.

Mark Ruffalo aka the Incredible Hulk is the natural gas industry's worst nightmare: a serious committed activist who is determined to use his star power as a superhero in the hottest movie of the moment to draw attention the environmental and public health risks of fracking.

Mark Ruffalo aka the Incredible Hulk is the natural gas industry's worst nightmare: a serious committed activist who is determined to use his star power as a superhero in the hottest movie of the moment to draw attention the environmental and public health risks of fracking.

Have we failed to slow global warming pollution in part because climate and environmental activists have been too polite and well behaved?

Have we failed to slow global warming pollution in part because climate and environmental activists have been too polite and well behaved?

Americans don't pay much attention to environmental issues because they aren't sexy. I mean cleaning up coal plants and reining in outlaw frackers is hugely important work but it doesn't get anybody's pulse racing.

Americans don't pay much attention to environmental issues because they aren't sexy. I mean cleaning up coal plants and reining in outlaw frackers is hugely important work but it doesn't get anybody's pulse racing.

Obama wants to be thought of as the president who freed us from foreign oil. But if he doesn't show some political courage he may well be remembered as the president who cooked the planet.

Obama wants to be thought of as the president who freed us from foreign oil. But if he doesn't show some political courage he may well be remembered as the president who cooked the planet.

One of the big questions in the climate change debate: Are humans any smarter than frogs in a pot? If you put a frog in a pot and slowly turn up the heat it won't jump out. Instead it will enjoy the nice warm bath until it is cooked to death. We humans seem to be doing pretty much the same thing.

One of the big questions in the climate change debate: Are humans any smarter than frogs in a pot? If you put a frog in a pot and slowly turn up the heat it won't jump out. Instead it will enjoy the nice warm bath until it is cooked to death. We humans seem to be doing pretty much the same thing.

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.

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.

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.

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

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

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.

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.