United Nations Secretary-General Ban Ki-moon announced today that the Paris Agreement on climate change signed by world leaders this past April is set to enter into force on 4 November, as enough countries have signed onto the landmark accord to bring it to the emissions threshold that will trigger its implementation. “This is a momentous occasion,” said Mr. Ban as the latest instruments of ratification were accepted in deposit. “What once seemed unthinkable, is now unstoppable. Strong international support for the Paris Agreement entering into force is a testament to the urgency for action, and reflects the consensus of governments that robust global cooperation, grounded in national action, is essential to meet the climate challenge,” he added.