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Geoengineering is no closer to working

(Climate Change News, 30 Oct 2018) Humans cannot expect a safer, cooler world from geoengineering. The only sure way to slow dangerous global warming and climate change is to cut greenhouse gas emissions.

Scientists have established a strategic error in one version of the climate change debate: they still say geoengineering is no guarantee of a cooler world.

There is no practical technology available to cool the Earth, they say – except the obvious one of ceasing to stoke the fires with fossil fuels.

One new study looks at all the tested and yet-to-be-explored mechanisms for either lowering global temperatures by reducing sunlight, or by harnessing new and old ways to capture the extra carbon dioxide released by two centuries of industrial growth.

And, the authors report, the sure way to reduce the dangers of global warming and keep the planetary temperature increase to 2°C or lower by 2100 is to switch to wind and solar energy sources and drastically cut fossil fuel emissions.

A second, separate study looks closely at an often-proposed form of geoengineering – the injection of sulphate aerosols into the stratosphere to intercept sunlight and shade the planet – and delivers a cautious verdict.

“None of the proposed technologies can realistically be implemented on a global scale in the next few decades”

Yes, it might reduce planetary surface warming. But the same technology could lead to continued ocean warming and ever-faster loss of the ice caps.

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Climate Change News, 30 Oct 2018: Geoengineering is no closer to working