UN chief António Guterres had a dire warning message for the world at Columbia University in New York on Wednesday, urging humanity to end the war against nature which has seen a collapse in biodiversity, record global warming and ocean temperature rises, and a global pandemic.

But he also said there was plenty of room for hope that a new, sustainable world can emerge from the pandemic, and an international coaltion of nations commited to net neutrality, by 2050. Here's his concluding remarks as he makes climate action the UN's top priority for the 21st Century.