It's quite cost effective to do something like: https://en.wikipedia.org/wiki/Stratospheric_aerosol_injectio...

Or https://en.wikipedia.org/wiki/Marine_cloud_brightening

The solutions to climate change are not technical, they are political.

Call politicians, protest, raise funds, join a party, become a politician yourself.

With just a $20 carbon tax we basically end coal, which is about 40% of our global emissions:

https://www.resources.org/common-resources/calculating-vario...

At $50 we end natural gas, at $100 we end oil.

Realise our predictions are fallible: https://edition.cnn.com/2020/01/08/us/glaciers-national-park...

There are some answers but you’d probably get downvoted in places like this for even suggesting them.