What was the biggest environmental achievement in the US in 2021?

In 2021, the biggest environmental achievement in the US was the Biden administration's commitment to addressing climate change through various policy initiatives and executive orders. In January 2021, President Biden signed an executive order to rejoin the Paris Agreement, which is an international agreement to combat climate change by reducing greenhouse gas emissions. This move was widely regarded as a significant step towards addressing climate change and was celebrated by many environmental activists and organizations.

In addition to rejoining the Paris Agreement, the Biden administration has also taken steps to address climate change through policy initiatives, such as the American Jobs Plan, which includes investments in clean energy, infrastructure, and research and development. The plan aims to create jobs and reduce carbon emissions, while also improving air and water quality. Other initiatives include a moratorium on new oil and gas leases on federal lands and waters, and the creation of the Civilian Climate Corps, which will provide jobs to young people and address the impacts of climate change.