IMHO the "climate change, we'll be gone in 10 years" argument is absolute bovine excrement - and the people giving that as a reason know it! They're just trying to rationalize their need for immediate gratification by pretending to have a politically correct liberal eco-mindset. In actuality, it's because saving for "the future" would interfere with their lifestyle in the here and now. And of course, if the world DOESN'T end, they can vote for someone who promises them that they'll be taken care of.
I've known a number of highly educated people with good (>$100k/year) jobs, often DINKs, who spent every last penny they had coming in so they could have a big house, a lake cabin, a Mercedes and a Lexus, a cleaning lady, and a daily Starbucks habit. But at least they didn't try to curry favor with various leftists by pretending to buy in to some climate or social justice nonsense as an excuse for not saving.