An interesting case where trying to make positive change resulted in an unintended consequence
Ah yes, I remember this news from months ago.
TL;DR for peeps in a hurry: Dirty emissions from cheap fuel-oil were making/seeding extra clouds over the ocean, enough to reflect a measurable amount of incoming sunlight.
New cleaner fuels (or electric power?) = no more extra clouds = slight uptick in global temp. Oopsie whoopsie.