The Paris Agreement, the new international climate treaty, enters into force today on 4 November 2016. This rapid entry into force, occurring within a year of its adoption, is unusual for an international climate treaty: to date, 97 Parties have ratified the Paris Agreement. Together they are responsible for around 70% of global greenhouse gas emissions. The agreement, negotiated just ten months ago, enters into force ahead of the UN Marrakech Climate Change Conference, which begins on 7 November.