From the Institute of Physics Website we learn that:
A key part of a UK-led project to investigate the feasibility of injecting particles into the stratosphere with the aim of cooling the Earth has been cancelled. In what would have been one of the first trials of geoengineering, the Stratospheric Particle Injection for Climate Engineering (SPICE) project will now not undertake field tests. Instead, the project will be restricted to lab experiments and computer simulations.
SPICE is led by Matthew Watson from the University of Bristol and mainly funded by the UK’s Engineering and Physical Sciences Research Council (EPSRC). The trial would have involved pumping water to a height of 1 km through a suspended hose that is held aloft by a helium-filled balloon. This would have tested the technology behind potentially spraying particles such as sulphur into the stratosphere, which would mitigate global warming by reflecting a few per cent of incoming solar radiation.
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