Maybe this is a bit of a pessimistic view, but they are bound to become disillusioned. Nobody will move as fast as they want them to. Even if they are experts in energy policy, energy market design or engineering (i.e. not "using the lens of literature and philosophy [...]" to use a quote from the article), their contribution to limiting global warming will be insignificant. If they have deeply anti-capitalist stances, they might find a job in a degrowth think tank and make even less of a difference. And most importantly, climate change poses much less of a financial risk to the economy than they think, so companies won't become environmentally conscious unless politics introduces those environmental externalities into their balances.

I'd consider myself a part of this group and I also want to find meaning in my work - but I try to manage my expectations.