资源环境科技发展态势分析平台

There is no silver bullet for climate change, no one answer. To save civilisation, nations must co-operate on five fronts.

LONDON, 20 May, 2021 − The world could meet a global commitment made six years ago to limit climate heating to no more than 1.5°C by the century’s end − but only by taking urgent and challenging action on five separate fronts, by doing so at speed, and ceasing to dream of a silver bullet for climate change.

In 2015, the world’s nations met in Paris and agreed to try to contain the inexorable rise in planetary temperatures by the century’s end, to “well below” 2°C above the historic average before the emergence of coal, oil and gas as fuel to power population growth, technological advance and the global economy.

But by 2021, the planet was already 1.2°C warmer than the historic levels, and research has repeatedly confirmed that so far all the commitments made at Paris will leave the world 3°C or more warmer. And this extra degree or more Celsius could have catastrophic consequences.

These include devastating sea level rise, murderous levels of heat extremes for 500 million people or more, and premature loss of life on huge scales, along with loss of health for even greater numbers.

Now an international team of distinguished climate scientists reports in the journal Environmental Research Letters that its members looked in detail at the action necessary to keep the promises made in Paris.

“We need a sustainability revolution to rival the industrial revolution”

And they have bleak news for the advocates of gradual change: there is no silver bullet, no engineering solution, no single answer that can address the challenge.

The researchers combed through 414 scenarios for greenhouse gas emissions, and found only 50 that had a chance of restraining temperature rise to 1.5°C in the next eight decades. They also looked at five different kinds of global action that could reduce atmospheric levels of carbon dioxide, to find that no single one of them meets the Paris target.

So the world will have to drastically reduce fossil fuel use to almost zero. It will have to restore and protect the natural wilderness − forests, wetlands, grasslands, mangrove forests and so on. Researchers will have to find how to draw down carbon from the atmosphere in ever-greater quantities and then identify ways of storing it for aeons.

Humankind will have to switch to a sustainable plant-based diet on international scales to help reduce emissions of  methane, nitrous oxide and other potent greenhouse gases. Industry, too, will have look for new efficiencies.

Daunting prospect

The switch away from carbon-based fuels is by far the most urgent step to be taken. “Yet we can’t do away with the other strategies,” said Lila Warszawski of the Potsdam Institute for Climate Impact Research, who led the study.

“Removing carbon dioxide from the atmosphere and for instance storing it underground also proves to be almost indispensable. Land use must become a net carbon sink, for instance by re-wetting peatlands or afforestation. Finally, emissions of the powerful gas methane must be cut from animal production, but also from leaks in oil and gas extraction. This is quite a list.”

And Tim Lenton, of the University of Exeter in the UK, reinforced the message. “This calls for an immediate acceleration of worldwide action to reduce greenhouse gas emissions by all available means,” he said.

“We need a sustainability revolution to rival the industrial revolution. Otherwise those most vulnerable to climate change are going to bear the brunt of missing the 1.5°C target. This is a system-wide challenge − piecemeal actions and rhetorical commitments are not going to be enough.” − Climate News Network

There is no silver bullet for climate change, no one answer. To save civilisation, nations must co-operate on five fronts.

LONDON, 20 May, 2021 − The world could meet a global commitment made six years ago to limit climate heating to no more than 1.5°C by the century’s end − but only by taking urgent and challenging action on five separate fronts, by doing so at speed, and ceasing to dream of a silver bullet for climate change.

In 2015, the world’s nations met in Paris and agreed to try to contain the inexorable rise in planetary temperatures by the century’s end, to “well below” 2°C above the historic average before the emergence of coal, oil and gas as fuel to power population growth, technological advance and the global economy.

But by 2021, the planet was already 1.2°C warmer than the historic levels, and research has repeatedly confirmed that so far all the commitments made at Paris will leave the world 3°C or more warmer. And this extra degree or more Celsius could have catastrophic consequences.

These include devastating sea level rise, murderous levels of heat extremes for 500 million people or more, and premature loss of life on huge scales, along with loss of health for even greater numbers.

Now an international team of distinguished climate scientists reports in the journal Environmental Research Letters that its members looked in detail at the action necessary to keep the promises made in Paris.

“We need a sustainability revolution to rival the industrial revolution”

And they have bleak news for the advocates of gradual change: there is no silver bullet, no engineering solution, no single answer that can address the challenge.

The researchers combed through 414 scenarios for greenhouse gas emissions, and found only 50 that had a chance of restraining temperature rise to 1.5°C in the next eight decades. They also looked at five different kinds of global action that could reduce atmospheric levels of carbon dioxide, to find that no single one of them meets the Paris target.

So the world will have to drastically reduce fossil fuel use to almost zero. It will have to restore and protect the natural wilderness − forests, wetlands, grasslands, mangrove forests and so on. Researchers will have to find how to draw down carbon from the atmosphere in ever-greater quantities and then identify ways of storing it for aeons.

Humankind will have to switch to a sustainable plant-based diet on international scales to help reduce emissions of  methane, nitrous oxide and other potent greenhouse gases. Industry, too, will have look for new efficiencies.

Daunting prospect

The switch away from carbon-based fuels is by far the most urgent step to be taken. “Yet we can’t do away with the other strategies,” said Lila Warszawski of the Potsdam Institute for Climate Impact Research, who led the study.

“Removing carbon dioxide from the atmosphere and for instance storing it underground also proves to be almost indispensable. Land use must become a net carbon sink, for instance by re-wetting peatlands or afforestation. Finally, emissions of the powerful gas methane must be cut from animal production, but also from leaks in oil and gas extraction. This is quite a list.”

And Tim Lenton, of the University of Exeter in the UK, reinforced the message. “This calls for an immediate acceleration of worldwide action to reduce greenhouse gas emissions by all available means,” he said.

“We need a sustainability revolution to rival the industrial revolution. Otherwise those most vulnerable to climate change are going to bear the brunt of missing the 1.5°C target. This is a system-wide challenge − piecemeal actions and rhetorical commitments are not going to be enough.” − Climate News Network