As asked
Get rid of religion.
The part where the ecosystem is in collapse?
Ideally, global warming, but it would be fair to view that as pointless when dissipating the extra CO2 doesn’t necessarily return the trees and the problem would degrade again in a couple hundred years. You’d have to introduce a new fuel source that is sought after, clean, and eternal. Which would be two wishes.
So you have to define it as both of your options, since the loss of either worsens the other. Turn the whole environment back to where it was in the 1200s, overrun the streets with bears, see if I care. It’ll give 'em something to do. Especially the Amazonian avocado farmers.
The Big Club running – and ruining – everything.
(NSFW - language)
More olive oil
That humans are actually the rational beings many claim themselves to be, rather than animals that makes decisions based on emotion and then rationalise why they made the decision.
I feel it would solve all the problems other commenters have mentioned.
Pretty much.
The co2 we are emitting into the atmosphere is leading to problems.
Rational response: reduce our co2 emissions as fast as possible.
Our constant population expansion and habitat destruction is causing a new mass extension event:
Rational response: Limit population growth. reduce environmental impact and regenerate damage already done.
Etc
etc
etc.
While I agree there are some problems that would be best solved through rational thinking, I wouldn’t want to live in a purely “rational” world. The entirety of the human experience lies between the gaps of rationality.