The Paris Agreement on climate change will enter into force on November 4 as enough countries have signed onto the landmark accord to bring it to the emissions threshold that will trigger its implementation, UN chief Ban Ki-moon has said. “This is a momentous occasion,” Secretary-General said after the deal was ratified by 72 countries accounting for more than 56 per cent of global greenhouse gas emissions. “Global momentum for the Paris Agreement to enter into force in 2016 has been remarkable. 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.