May want to make a correction to the title. A relative decrease of 1.6C is not equal to a relative decrease of 35F. Assuming current temp from google is accurate (59F = 15C), a decrease of 1.6C = a decrease of ~3F.
Diamond dust could be the ultimate shield against global warming, outperforming other materials in reflecting sunlight and avoiding acid rain. But with a $200 trillion price tag through 2100, this ambitious geoengineering solution might be too expensive to implement.