When I 1st heard about the plan to block out the sun instead of dealing with our relentless pollution, consumerism and population overshoot I cringed more than on any occasions before.
It is not an "instead", it is an "as well." We need geoengineering as well as reductions in pollution. Population control is not important at all though.
I ended up following BCH because it proposed a smarter development path. Sadly the anarchists are too loud to male the wider market take BCH seriously.
That said business can do more than governments. Just look at what Elon is doing with Tesla. They are the front line in the fight against climate change.
Humanity can affect the temperature/global climate. We already have been geoengineering, now we just need to do it in a beneficial way instead of a destructive way.