Nothing, I’m only making a better world if I can make my own life better at the same time. I do live an extreme frugal existence and avoid working for any unethical organization, but it’s not a sacrifice.
What we can “bear” is the wrong question for a couple reasons:
Consumer luxuries don’t actually make for a better life.
Altruistic scheming isn’t anyone’s actual motivation for doing things.
“sacrifice” is irrational bargaining; reality doesn’t care whether you’ve made yourself enough of a martyr, and people who want to be martyrs don’t care if what they’re sacrificing actually makes much of a difference.
An effective solution will involve changes we can be happy about and a lifestyle that is actually better than what we have now. Commutes and lives spent stressing over money are a shit trade for what people get from it anyway, it won’t be hard to do better with less.