Giving What We Might Be Able To
One Oxford undergraduate was so inspired by Toby Ord that he has apparently pledged to donate 10% of his future earnings to charity.
Given that he's assuming he'll be earning £40k/year, and the 10% is taken after student loans (not clear about other deductions), that should still leave him fairly well-off. Nonetheless, I think we have good reason to praise those doing more than most, even if we think they're doing less than perhaps they ought. The amount that this one person gives over the course of his life, assuming he keeps his pledge, will do a lot of good.
I wonder if that counts as research impact?