Enlarge / Stratospheric aerosols can make for great sunsets, regardless of how they get there.Rachel Dulson
Humanity has managed to stabilize its carbon emissions, but they have yet to start trending downwards. It looks increasingly probable that we’re going to emit enough to commit to at least 1.5° C of warming—and we need to act quickly to avert going past 2° C. This failure to get our emissions in order may force us to consider alternatives such as pulling carbon dioxide out of the air or geoengineering to reduce the amount of incoming sunlight.
Of the two, geoengineering comes with
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