UNBURNABLE CARBON

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In December 2015, almost 200 nations signed on to the Paris climate deal, agreeing to cut greenhouse gas emissions in an attempt to avoid catastrophic climate change. While the Paris agreement is only the first of many steps that need to be taken to achieve this goal, it clearly spells the end for fossil fuels.

The Paris text commits governments to limiting global warming to less than 2°C above than pre-industrial levels, with an aim to cap temperature rise at 1.5°C. While climate scientists widely agree that if the most damaging effects of climate change are to be avoided warming must be limited even further, the 2°C target has been used to calculate the maximum carbon dioxide (CO2) that can be released into the Earth’s atmosphere, giving us a ‘carbon budget’ to work within.

As reported by the Carbon Tracker Initiative, the carbon budget for 2013 to 2049 was 565 Gigatonnes. However, the fossil fuels that are held in current reserves represent an estimated 2,795 Gt of potential CO2 emissions if dug up and burnt.

That’s five times the ‘safe’ amount, and means that around 80% of the world’s current fossil fuel reserves must remain in the ground if we can realistically hope to avoid the most catastrophic effects of climate change.

Courtesy of University College London, the latest exploration into unburnable carbon under a 2°C constrained world suggests that, for a 50% chance of avoiding two degrees of warming, a third of all the world’s known oil reserves, half of all gas and over 80% of all coal must stay underground if we are to keep from breaching the limit. Here in Australia these numbers jump up to over 50% for both oil and gas and around 95% for coal.

To learn more about what the carbon budget could mean for fossil fuel companies and assets, check out our stranded assets page.


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