The data that Burdis and Jankowski are looking at is much newer, dating back about 30 years, but it shows a similar trend. Midwinter ice depth has decreased across the sites they monitor, and ice ...
But the ice below is too thick for any tour boats to break through since the Niagara River, on the border of the USA and Canada, froze over this week. Temperatures dropped as low a -7°C on ...