[dannypgh]

The idea of terraforming Mars seems increasingly quaint given how hard it's been for us to keep the Earth comfortable for humans.

I think it makes far more sense to work on geo-engineering solutions to climate change first - it's also more likely to have a viable business model, on the assumption that the people will eventually demand action rather than applaud their leaders for pulling out of the Paris Accord.

I think pretty much all of the tech applicable to terraforming Mars could also be useful for reducing Earth's CO2 levels, no? Maybe let the problems on Earth guide development and drive funding, and pivot to Mars once it's clear success is being had on Earth.