Sailing on thick ice

This photograph was taken in the winter of 2014 on the Hudson River in the US state of New York. That year, temperatures were so cold for so long that antique wooden ice yachts were taken out of storage and onto the river to sail down a 20-mile stretch of thick ice. It had been years since the Hudson River had frozen sufficiently for safe ice sailing, due to global warming.
© Mike Segar/REUTERS