A major shift in global shipping regulations intended to improve air quality may have temporarily — and inadvertently — set off a geoengineering reaction that is warming the planet, new research has found.
An interesting case where trying to make positive change resulted in an unintended consequence
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.