"Planetary-scale solar geoengineering interventions involve the deliberate injection of either natural or artificial particulates into the stratosphere stratospheric aerosol injection, or SAI with a view to offset some of the global heating caused by greenhouse gases. If implemented, the technology would create a metaphorical thermostat for the planet. Such a thermostat is advocated on the grounds that controlling global temperature reduces the harms associated with the climate crisis."
"Global temperature was first adopted at the beginning of this century as a way of indexing the extent of human impact on the climate system. Since then, managing global temperature has become the primary object of climate policy, thus the Paris agreement's stated aim being to contain global warming between 1.5C and 2C. The policy goal of net zero emissions is derived from this target temperature range."
Planetary-scale solar geoengineering via stratospheric aerosol injection (SAI) would deliberately add particulates to the stratosphere to offset some global heating. The approach aims to lower global-average temperature by a few hundredths to a few tenths of a degree Celsius rather than removing atmospheric greenhouse gases. Global-average temperature is a crude proxy for climate impacts and managing it has become central to climate policy, shaping targets like 1.5–2C and net zero goals. SAI may modestly reduce global temperature while doing little to address local weather extremes and ecosystem stresses, and it risks exacerbating some harms.
Read at www.theguardian.com
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