Hikers in New Zealand risk polluting the “clearest lake in the world” with a microscopic alga carried on their boots.

"Whatever iteration it becomes next, I hope we do take into account what communities around New Zealand want," campaigners say.

Skaneateles, with its unique shops and restaurants, sits astride the northern tip of Skaneateles Lake in Onondaga County.

Once a shimmering 68,000-square-kilometer (26,000-square-mile) inland sea straddling Uzbekistan and Kazakhstan, the Aral Sea ...