Portside

On a day of 2,700 simultaneous climate events from Melbourne to Manhattan, the US secretary of state, John Kerry, reinforced the calls from the streets for action by calling on world leaders to take the threat of climate change as seriously as Isis or Ebola.

From as close as the Bronx and as far as at least Rome, the demonstrators came in vast numbers. At one point early in the afternoon, the march came to a halt because the entire 2.2-mile route was full, and more than two hours into the procession, people were still setting out from the starting point near Columbus Circle.