4% of the world’s oil production goes into making plastic grocery bags. That’s four out of every 100 barrels of oil pumped out of the ground!
Too many of them end up in landfills, where it takes 1000 years for them to decompose. Ditto for all the other petroleum-based plastics that get used once (or were used as packaging and thus never really used) then discarded. A hideously wasteful, and uncomprehending system indeed.