Pay all the violent, ignorant, anti-social people NOT to have children. Stop the worst people having kids and you’ll transform society within a generation. And before anyone calls me a snob, it is the good people on low incomes who’d benefit the most.
Globally, I would build a family planning clinic in every village on earth. I would also discourage people from having more than two or three kids. Birth control is the greatest invention in human history. It has done more to reduce poverty and misery and suffering than anything else. Family planning is at the heart of female emancipation. Catholics who preach against birth control in the slums of Africa and India should be in prison. How can they look a poor, exhausted woman in the face, someone living in a tin shed with five kids, and urge her to have a sixth? How do they sleep at night?
If I could have a couple more, I’d get rid of organised religion. Maybe replace it with a vague New Age spirituality, something that combines Buddhism and quantum mechanics (Eckart Tolle, Fritjof Capra, etc).
Finally, a massive investment in science, and especially in the life sciences. We really could cure most diseases and possibly even slow and reverse ageing. If you don’t believe believe me, read Andrew Steele’s new book.