Effectively removing CO2 from the atmosphere

Dragonfly Mission To Titan Announces Big Science Goals. The goals for Dragonfly include searching for chemical biosignatures; investigating the moon's active methane cycle; and exploring the prebiotic chemistry currently taking place in Titan's atmosphere and on its surface.

Astronomers Probe Layer-Cake Structure of Monster Brown Dwarf’s Alien Atmosphere

Discovery Alert: A “Cool” Neptune-Like Planet – With Plenty of Atmosphere?