It took us a long time, but overall emissions in the US are down about 10% from their peak in 2005, even when you adjust for us exporting manufacturing to elsewhere. This only brings us down to ~1996 levels, but it's a good sign. Per capita, we're back down below 1990 levels[0]. (I think this is mostly from some energy-efficiency improvements and less coal, though a lot of that has just shifted to natural gas[1].)

It's not nearly enough, and may be overwhelmed by China and India's development, but significant positive change is happening. It just took us until ~2007 to really get things moving.

[0] https://ourworldindata.org/consumption-based-co2

[1] https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emis...