Question special

A study published last spring in Nature reported that there was a 17% temporary reduction in greenhouse gas emissions due to COVID-19 lockdowns ( However, a different study conducted later last year noted that the reduction in emissions is negligible in the long term ( Various studies have also noted a reduction in air pollution due to decreased human activity during the lockdowns, thereby decreasing the risk for contracting COVID-19 for high-risk patients with multiple co-morbidities like asthma, COPD, etc.

My question is, what kinds of “green recovery” policies can be introduced here in the United States to sustain the reduction in greenhouse gas emissions that we have seen during lockdowns?