There are a lot of money scams out there to be sure.

It's unlikely that something like carbon capture will ever significantly reduce the CO2 in the atmosphere. It's just too energy intensive.

But there are a lot of practical solutions to significantly curb emissions that mostly just require regulations and taxes.

Things like building out rail transport. Heavily taxing air travel. Taxing all forms of carbon emission (fuel taxes would be pretty effective). Subsidizing non-co2 emissions, pushing for electrification when possible and power generation which uses non-CO2 emission. Stop wasteful pipedreams like "clean coal". Force data centers to be better citizens. For example, make them buy the battery/solar systems to offset their consumption. Make them participate in district heating schemes.

There's also some hope that even without intervention some of this will happen somewhat naturally. Solar and battery is already very cheap. Both are causing changes in the shipping and transit equations.