[mywittyname]

> Is there a specific policy that he championed that is responsible for this?

This was something the President activity campaigned on (Build Back Better), pushed through Congress, and signed into law as The Inflation Reduction Act.

While it did little to reduce inflation (outside of medicine), it was a massive win for people who wanted more investment in clean power generation, more funds for the ACA, lower drug prices, and higher taxes on certain corporate entities.