Does anyone else think about how, even if we totally switched to renewables or nuclear, and used geoengineering to obstruct sunlight, that utilizing energy in the earth system that would have escaped before NECESSARILY & INEVITABLY GENERATES THERMAL POLLUTION
As such, as long as GHGs stay in the atmosphere, let alone rise, some portion of heat that wouldn't have been trapped otherwise will be trapped, EVEN IF it's through renewables in the form of thermal pollution.
This is especially bad for bodies of water and for urban heat sinks. What's more even w/o fossil fuels, emissions & GHGs will continue due to agriculture, land degradation, permafrost melting, deforestation, soil release, and ocean sink exhaustion.
Thus, even if tomorrow all energy became nuclear or renewables, and we geoengineered the climate, we'd still get warming thru GHG emissions & thermal pollution, unless we continued geoengineering for literally ever.
Carbon capture & sequestration requires a permanently managed system with little to no failure, and throughput use 70% higher than our current system, meaning it would exacerbate roughly 7/9 planetary boundaries, and all 9 if its mechanisms failed.
Aerosol loading would slow warming, but it'd also cause mass disruption to equatorial ecosystems, require permanent maintenance, erode other planetary boundaries, and cause negative feedback loops.
Only TRUE decarbonization will suffice, and that requires RADICAL AND TOTAL CHANGES IN LAND USE, AFFORESTATION, RESTORATION, DOWNSCALING, AND THE LIKE. Technofixes will not work, they will actually worsen it in many cases.
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