While it’s a good idea, what determines if a job “benefits the environment”?

A lot of jobs in the list - particularly any startup jobs - are at best unproven in their effect on anything and at worst are a drain on funding resources and have worse negative externalities to the world than being productive in a job that’s not nominally “about” the environment, as well as the risk you’ll invest years of labor under the assumption the company has a mission to improve the environment only to see it pivot when the business realities crash the party.