The Paris Agreement, signed in 2015, is a global agreement to combat climate change. It aims to keep the global temperature rise below 2 degrees Celsius above pre-industrial levels and to pursue efforts to limit the temperature increase even further to 1.5 degrees Celsius. The United States, under President Barack Obama, was a key player in negotiating the agreement and was one of the signatories. However, former President Donald Trump pulled the US out of the agreement in 2017, stating that it was unfair to American workers and businesses.

Since taking office in January 2021, President Joe Biden has taken steps to rejoin the Paris Agreement. On his first day in office, he signed an executive order to rejoin the agreement and officially notified the United Nations of the US`s intent to rejoin. The US officially rejoined the Paris Agreement on February 19, 2021.

Rejoining the Paris Agreement is a crucial step towards combatting climate change, as it provides a framework for countries to work together towards reducing greenhouse gas emissions. The US is one of the world`s largest emitters of greenhouse gases, and its participation in the Paris Agreement is essential to achieving its goals.

In rejoining the Paris Agreement, President Biden has made it clear that his administration is committed to taking action on climate change. His administration has set ambitious targets to reduce greenhouse gas emissions, including a goal of net-zero emissions by 2050. The US will also host a Leaders` Summit on Climate in April 2021, where world leaders will discuss their efforts to combat climate change.

In conclusion, the US is back in the Paris Agreement in 2021, signaling a renewed commitment to combatting climate change. President Biden`s administration has outlined ambitious targets to reduce greenhouse gas emissions, and the US`s participation in the Paris Agreement is essential to achieving these goals. The world will be watching as the US takes action on climate change and works with other countries to create a more sustainable future.