Real-world geoengineering experiments revealed by UK agency

Real-world geoengineering experiments spanning the globe from the Arctic to the Great Barrier Reef are being funded by the UK government. They will test sun-reflecting particles in the stratosphere, brightening reflective clouds using sprays of seawater and pumping water on to sea ice to thicken it.

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The Aria-funded experiments include sending a weather balloon into the stratosphere above the US or UK. Milligram samples of non-toxic mineral dust will be exposed to the high-altitude conditions and then recovered to assess how the particles’ properties change with time.

Another three experiments will test how seawater sprays or electrical charges delivered by drones can seed tiny water droplets, making clouds over the oceans reflect more sunlight. One will expand current work over the Great Barrier Reef, which is in crisis because of global heating, and may reach 100sq km in scale, while another will take place on the UK coast.

A fifth experiment will involve pumping water on to sea ice in Canada in winter, reaching up to one 1 sq km in scale. The water will freeze and preserve the ice sheet for longer in summer. Bright white ice reflects far more sunlight than the dark ocean revealed when sea ice is lost to warming waters.

There will be an environmental impact assessment made public before any outdoor experiments take place and local communities will have been consulted. There is also an independent oversight committee as part of the approval process, Aria said, chaired by the leading climate scientist Prof Piers Forster and including members from India and Ghana.

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