To dam a river you flood the upstream portion to create a height difference in the river that your can use to generate electricity.
This flooding submerges MASSIVE amounts of vegetation which undergoes anaerobic decomposition releasing tons of methane. It’s a one time thing, but it’s actually up there when you include the expected lifetime of a hydro plant, and the fact that methane is a very powerful greenhouse gas.
I think this is cool. Many of these are accessible and cheap. Most of these are “do you get out of the house and spend time on something” which is obvious. Looks like most hobbies are attractive, like even anime and cosplay have 1 out of 4 women who is into that and finds it attractive.
I also love the huge correlation between the top 15 and what men think is the top 15, the main difference is that men didn’t think hobbies were attractive enough.
I’d love to see the reversed list for what men think are attractive hobbies for a woman!