Solar Geoengineering, would aim to address a symptom of climate change by reflecting more sunlight back into space in order to reduce the Earth’s temperature.
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With the timely achievement of the Paris climate targets becoming more and more uncertain, there have been calls for stepping up the development of climate engineering to complement mitigating greenhouse gas emissions. But is it really an option?

The 2015 Paris Agreement seeks to keep a global temperature rise “well below two degrees Celsius above pre-industrial levels and to pursue efforts to limit the temperature increase even further to 1.5 degrees Celsius” this century. However, the International Panel on Climate Change (IPCC) conceded in 2018 that achieving the lower target would be a “herculean task”. If global warming continues at its present rate, the 1.5 ° C limit could already be reached by around 2040. Proposals to boost efforts to slow down global warming include climate engineering, a controversial issue that was also the subject of a panel debate at the recent Knowledge for Sustainable Development (K4SD) conference held by the Global Development Network in Bonn/Germany in late October. 

Climate engineering, also known as geo-engineering, refers chiefly to two main groups of technologies: greenhouse gas removal approaches and solar radiation management (SRM). Also called negative emissions technologies (NETS), greenhouse gas removal includes methods such as ocean fertilisation, in which e.g.

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