People have continually been taking significant action! CFCs were banned in 1987. High GWP refrigerants, like R-12 and R-22 have been banned, and even newer ones like R-401 are now significantly regulated: The days of bleeding an air conditioning system to atmosphere are _long_ gone. Cars in developed countries are annually inspected for emissions systems performance, so NOx and other GHG-producers have been cut to nearly 0% from vehicles since the 1990s in those regions. Transoceanic shipping has recently implemented its sulfur-free requirement, and we're visibly seeing fewer sulfuric clouds over the ocean. Stricter gas milage requirements in cars have seen a drop in CO2 emissions in the US from 2007 to 2025 by 102 million metric tons of CO2, despite having 23,000,000 more people.

The Paris accords have been running for years. No country has met its targets but nearly every country has seen a reduction.

The reductions aren't as big as we'd like. The temperature is still rising faster than we'd like. But the idea that we haven't taken any action is completely false.

>Transoceanic shipping has recently implemented its sulfur-free requirement

While probably a good thing for ecosystems, this has removed an unintended "geoengineering" effect. Sulphur dioxide forms a relatively effective reflector for incoming solar radiation.