A UN report and a warning from scientists comes amid tests from new geoengineering companies.
Scientists are slamming the brakes on deliberately interfering with the climate to temporarily counteract global warming until the pros and cons are more fully known.This is occurring just as commercial ventures are starting to plow forward with geoengineering plans of their own, with a profit-seeking motive.
SRM would involve injecting particles into the atmosphere to deflect incoming solar radiation, cooling the planet temporarily., an expert panel convened by the UN Environment Program pours cold water on the notion that SRM is anywhere near ready. “Even as a temporary response option, large-scale SRM deployment is fraught with scientific uncertainties and ethical issues. The evidence base is simply not there to make informed decisions," wrote UNEP head Inger Andersen, in a cover letter accompanying the document.
Andersen notes that SRM may be needed since the world is currently off course from meeting its Paris temperature targets."This expert panel considers that the scientific, technical, social and environmental aspects of a large-scale deployment of SRM have not been fully assessed and deployment is not warranted at present," it states.
And to be effective, SRM would need to be maintained for several decades to centuries, depending on emissions cuts and carbon removal rates, the report finds.
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