IIRC worldwide subsidies for fossil fuels is around 6 trillion, and military spending near 30 trillion, if we stopped doing those things, would help the planet immensely.
I have come to despise the "defending the hypothetical person" tactic, not only as it has become popular in politics, except that because the hypothetical person does not exist, the defender bears no responsibility towards them, and can say or do anything.
GURPS can be 100% relevant by making a bespoke core for the separate settings, which it is more of a marketing decision, such as in fact they already do in settings having templates. I mean even with a bespoke core for a setting, most GM's are going to buy the full core, I did.
At the signing of the peace treaty of Tau Ceti the prime minister Sato of Earth came dressed as if for a funeral, and when asked she said briefly:
"Weapons are tools of misfortune, war destroys the creativity of people, and where armies onece camped, only nettles grow. Every victory should be...
There are a lot of good books in the list. I haven't read Ready Player One, so no comment. The nice thing about books is one can read another, they don't get jealous.
Yes, there has been a positive return on the investment, beyond science and technology knowledge.
As far as "fixing the world" is kind of doctor heal thyself.