Most of the discussion of combatting climate change focuses on reducing atmospheric CO2, but there's an entire second category of approaches: Solar Radiation Management, some of which could be much faster and cheaper than reducing CO2. https://en.wikipedia.org/wiki/Solar_radiation_management

While reducing CO2 emissions via investment in renewables is still an important long term goal, if we're already heading towards a potentially catastrophic situation, it seems we should be investigating other forms of climate engineering more seriously?