Some governments are gambling that the only way to deal with climate change is the massive restructuring of the earth.
What goes up, however, still (usually) comes down. Be it silver iodide, sulfur, or salt
spray, the ton of particles that would need to be regularly blasted into the stratosphere
will find their way back to earth again. All the issues related to environmental health
and safety associated with particulate pollution, including novel manufactured
nanoparticles, remain relevant for these intentional polluting schemes. Climate change
experts insist that we should distinguish between unintended pollution and climate
modification schemes that pump particulate matter into the air we breathe. But our
lungs won’t know the difference.