The United States and China have issued a joint presidential statement confirming that they will each sign the Paris Agreement on April 22nd and take steps to join the agreement as early as possible this year, and calling on other countries to do the same. This statement builds on the action generated by the presidential joint statements over the last two years, which has been an important catalyst of international action on climate change. The new showing of mutual confidence and continued commitment will contribute to worldwide momentum to tackle climate change and implement the Paris Agreement.