3.5.7.7 Geoengineering

An LSE article, What is geoengineering and how could it help tackle climate change?, opens with this definition:

“Geoengineering, also known as climate engineering, describes a range of ways to intervene on a large scale in the Earth’s natural systems – the oceans, soils and atmosphere – to directly combat climate change. They mostly fall into two categories: those designed to remove carbon dioxide (CO2) from the air and those that try to limit the amount of sunlight that reaches the Earth’s surface.”

Such ideas are tempting to some economists because they appear to be cheaper than trying to cut carbon emissions.  For example, one assessment of ways of reducing global warming, Copenhagen Consensus on Climate – Results, rated climate engineering options as offering the best value and cutting carbon emissions as the least cost-effective approach.

The LSE article referred to above sounded a note of caution about using unproven technologies with possible unintended consequences.  A Prospect article, Why geoengineering isn’t the solution to the climate crisis, argued that “Simply using technology to cool the planet, without simultaneously slashing greenhouse gas emissions, would set us on the road to catastrophe” and suggested that geoengineering presents a “moral quandary”.

It would be irresponsible to suggest that geoengineering could be the only solution needed, but it can supplement other attempts to mitigate climate change.  Growing trees is a straightforward way of extracting carbon from the atmosphere.  And at least one of the techniques for solar radiation management could also contribute:

“‘marine cloud brightening’, where the clouds that cover oceans could be made lighter in colour and more reflective by spraying tiny droplets of seawater into them, causing them to reflect more sunlight back out into space.”

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