....hundreds of millions doesn't solve climate change.

Mostly oligarchs invest their money in companies. So, they own shares. They could sell the shares to someone, and then they have money.

So, suppose you had a net worth of $10 billion in shares. You now have the same in liquid wealth.

How do you stop climate change? You seem to think it is easy to do with money, pieces of paper and ones and zeros in a bank account.

What do they buy, off the shelf, that solves the problem, easy as that?

You could perhaps buy rights in an oil field and then refuse to mine it. That would help.

You could fund research into solar cells or invest into the market. Though investing money isn't what makes a venture successful: customers actually have to buy the resulting product.

So how do you use your $10 billion to make people stop buying carbon? You seem to think it would be very, very easy. So tell us what practical step they could take, on their own without popular support. Simply by being an oligarch.

Spend a ton of money lobbying for alternate power (nuclear plants, renewables). Push legislation that cuts down on carbon footprints (e.g., better networks for remote work, encourage building mixes that reduce commuting).

Ten billion isn't that much money compared to the problem, but you can do some smart things with it.

That + basic research would be my goto. It would definitely be helpful, I agree.

I just wanted to show OP that the scale of the problem isn't something oligarchs can "easily" solve.

For one, sponsor lobbyists for renewables and invest in renewable energy plants. Do this especially where this competition from fossil fuel plants, with a clear intent to attempt to shut them down due to lack of business. Most customers will buy cheaper energy from renewables.

Eyeballing this IEA report, globally there's about $600 billion per year spent on renewables, battery storage, and nuclear: https://www.iea.org/wei2018/

And let me assure you they have lobbyists.

Meanwhile, you have $10 billion to spend, once. It isn't an annual flow of money.

More renewable investment is helpful! But I fail to see how oligarchs could solve the problem as simply as you suggest simply by investing in renewables and lobbying.

And yet Notre Dame isn’t repaired/rebuilt yet. If all it needed were money then it would have been done the day after.