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1bn homes under water

Burning remaining fossil fuels could cause 60-metre sea level rise
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New work from an international team including Carnegie’s Ken Caldeira demonstrates that the planet’s remaining fossil fuel resources would be sufficient to melt nearly all of Antarctica if burned, leading to a 50- or 60-metre (160 to 200 foot) rise in sea level.

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Because so many major cities are at or near sea level, this would put many highly populated areas – home to over a billion people – under water, including New York City and Washington, DC.

‘Our findings show that if we do not want to melt Antarctica, we can’t keep taking fossil fuel carbon out of the ground and just dumping it into the atmosphere as CO2 like we’ve been doing.

‘Most previous studies of Antarctic have focused on loss of the West Antarctic Ice Sheet. Our study demonstrates that burning coal, oil, and gas also risks loss of the much larger East Antarctic Ice Sheet.’

Ken Caldeira, report author

Antarctica’s future

Although Antarctica has already begun to lose ice, a complex array of factors will determine the ice sheet’s future, including greenhouse gas-caused atmospheric warming, additional oceanic warming perpetuated by the atmospheric warming and the possible counteracting effects of additional snowfall.

‘It is much easier to predict that an ice cube in a warming room is going to melt eventually than it is to say precisely how quickly it will vanish.’

Ricarda Winkelmann, lead author, Postdam Institute for Climate Impact Research

Unstoppable ice loss

The team used modelling to study the ice sheet’s evolution over the next 10,000 years, because carbon persists in the atmosphere millennia after it is released.

They found that the West Antarctic ice sheet becomes unstable if carbon emissions continue at current levels for 60-80 years, representing only 6-8% of the 10,000 billion tons of carbon that could be released if we use all accessible fossil fuels.

‘The West Antarctic ice sheet may already have tipped into a state of unstoppable ice loss, whether as a result of human activity or not. But if we want to pass on cities like Tokyo, Hong Kong, Shanghai, Calcutta, Hamburg and New York as our future heritage, we need to avoid a tipping in East Antarctica.’

Anders Levermann, co-author, Postdam Institute for Climate Impact Research

2°C limit

The team found that if global warming did not exceed the two degree Celsius target often cited by climate policymakers, Antarctic melting would cause sea levels to rise only a few metres and remain manageable.

But greater warming could reshape the East and West ice sheets irreparably, with every additional tenth of a degree increasing the risk of total and irreversible Antarctic ice loss.

‘If we don’t stop dumping our waste CO2 into the sky, land that is now home to more than a billion people will one day be underwater.’

Ken Caldeira, report author

Future rises

This is the first study to model the effects of unrestrained fossil-fuel burning on the entirety of the Antarctic ice sheet.

The study does not predict greatly increased rates of ice loss for this century, but found that average rates of sea level rise over the next 1,000 years could be about three centimetres per year (more than an inch per year), leading to about 30m (100 feet) of sea level rise by the end of this millennium.

Over several thousand years, total sea level rise from all sources could reach up to 60 metres (200 feet).

The research is published in Science Advances. Click here to find out more.

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