Asklemmy

More effective would probably to buy yourself (or a person that has political potential/influence with the right intentions) into politics like president muskrat, and do well placed populistic propaganda against the actually evil fossil industry. You don't even have to lie, just do some good rethoric speech, ads etc.. We need policies on a larger level, and I think 10B$ should be enough to gain significant political influence for something that the major mass of people is already behind of, just needs a good spark. I think Thunberg has shown that. Not that we shouldn't of course improve public transport in cities. Additionally do (employ) investigative journalism probably in the same process to give all of this a good foundation..

10K is a home solar investment. Where I live, people tend to live in multi-family buildings about 3-6 floors high, often split between siblings and their families. Depending on how many are in the country year-round, that might even be enough for the whole building with careful management. Obviously wouldn’t be the same if the neighbors are strangers. (I appreciate that the familial emphasis might seem a bit random in your culture). Ideally 10K might just be enough for one or two households.

The much more interesting prompt is 10B, imo.

10B? Oh man. I’m in Lebanon. We’ve effortlessly squandered more generous fortunes than a measly 10B grant, but here’s how I’d do it:

1B: buses, trams and parking garages to decongest some of the nicer (and underperforming, touristy) old town areas. Should give them a sorely needed boost 3B: modern seaside train running from north to south, with a small number of branches into the interior. Mostly freight. 3B: start phase of a Beirut metro. It’s not enough for a full metro system especially with our geological conditions, but the core city isn’t too big and one line should be feasible? 2B: functional army so we still have civilian infrastructure next time our noisy neighbor gets a hissy fit (infrastructure is worthless if it’s destroyed) 1B: modern fossil fuel power plant. Yeah it’s not green, but we generate a fraction of our needed power, meaning most people have to pay off a local generator mob for electricity. They use diesel and relatively inefficient smaller generators. Our existing ancient power plants use dogshit-tier diesel. I insist that some kind of LNG plant maybe would actually make the situation more green. As it stands the convenience of combustible fuel is more pertinent than the environmental cost

Ya its a decent start. My point here is the scale of what we're facing. Its going to take trillions of dollars, synchronous action taken by many nations simultaneously and a complete restructuring of the current world order. There's always hope but at this point i'm fairly cynical and don't have a lot of faith that the right people are in charge to even start the conversation.