Yikes.
There is a better alternative: it is very well known/studied that women that have a strong position and are educated have less children.
One (poor; your words) man without a vasectomy can knock up many women. Hence I think it's better to focus on the women.
Sure I get that having many children is a multiplier, but even if that average Bangladeshi couple has 4 they still dont contribute as much to environmental destruction as an average US couple without kids.
My solution would be (as only picking on someone's solution is not nice in a discussion): only tax pollution, scarce resources and stuff that otherwise needs to be disincentivized. Only. So no tax on wholesome behavior like income from labor or housing. And yes: money is a scarce resource (tax the shit out of it over say 5 or 10MM USD). This will rearrange the economy to do good for us all + nature.
The author mentioned paying poor men for vasectomies as the quickest and pretty much only solution to environmental problems.
It should be pretty clear why improving education is not a yikes while eugenics is.
I am suggesting that the attempt of suppressing reproduction within a particular demographic, no matter the incentive or perceived "good" that results (cash or education), is walking a very fine line.
Coercion is waaaay less, to the point that I'd like to say educating is not coercing. Education can be undone, unused, forgotten. Vasectomies not so much. I dont think "totally" suppressing reproduction is what happens: those women still want/can/will have babies, just not so many.
The sequel to borat was basically about borat lying to his daughter about what women can and should do and her seeing through the lies eventually. Some countries are really behind the times and "backwards" ideas that were common in Europe 200 years ago can still be found there today.
Why poor men?
You might find this article relevant to your interests[1].
Experts estimate 15 to 40 percent of men undergoing vasectomy experience a sperm granuloma. In some instances, a man may have to have the granuloma surgically removed.