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.
Geoengineering > Eugenics.
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.
