Denkenberger comments on The Map of Global Warming Prevention - Effective Altruism Forum

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Comment author: Denkenberger 25 November 2016 10:38:34PM *  0 points [-]

This has a more comprehensive list of emission reduction techniques, including building energy efficiency, industry energy efficiency, carbon capture from power plants and storage (at the bottom of the ocean or underground), nuclear energy, etc. As for removing the CO2 from the air, other options include growing biomass and burying it, encouraging cultivated lands to store more carbon (actually considered in the paper above), and chemical capture from the air and storing it underground. A hybrid technique is growing biomass, making liquid fuel, and sequestering the CO2, which is overall net negative emissions. As for solar radiation management, other options for increasing stratospheric reflectivity include photophoretic levitation of engineered aerosols, and nanoparticles from combustion. We might be able to use equatorial mountain combustion to inject the particles into the stratosphere. Other options for increasing surface albedo include reflective balloons in the ocean (not a good idea because of impact on marine life). A benefit of solar radiation management over reduction in emissions is that it enables higher agricultural productivity via CO2 fertilization. This is important because most of people who are in extreme poverty are farmers. Though CO2 fertilization was found to be not as large as once thought in natural ecosystems, the effect is large in agriculture because needs like water and fertilizer are generally provided for. Another benefit of solar radiation management is that if it looked like we were heading back into an ice age, we could turn it off.