President Joe Biden on his first day of office signed an executive order to have the United States return to the Paris Climate Agreement. In his executive order, he said “I, Joseph R. Biden Jr., President of the United States of America, having seen and considered the Paris Agreement, done at Paris on December 12, 2015, do hereby accept the said Agreement and every article and clause thereof on behalf of the United States of America.” With that in mind, what is the Paris climate agreement? Why did we leave, and what does it mean to be back?