I have a flash fiction piece up at Farther Stars Than These, sci-fi about noise and silence in a future world: http://www.fartherstars.com/
“There were old recordings of silence, but they couldn’t be heard for the din. Of course there were density isolation chambers, but only the obscenely wealthy could enjoy those … Only the old ones remembered silence, the pure natural kind and what it was like.”
outcosm.com 
Solar powered cooling rods sunk into the permafrost.
Carbon capture domes.
Fleets of ocean misters creating aerosols of sodium chloride.
A carbon tax – with 100% of the winnings diverted to research for a techno solution to a techno problem.