Lake ice is getting weaker in Sweden, posing risks for winter activities / Harrowing moment extreme cold swimmer gets trapped under ice and drowns in frozen lake / Study: Lake ice becoming unsafe, increasing drowning risk / Lakes are losing winter ice cover at an astonishing rate / Loss of lake ice has wide-ranging environmental and societal consequences, analysis suggests / Fewer fish and more algae? Scientists seek to understand impacts of historic lack of Great Lakes ice / "Lost winter": Great Lakes ice cover sets record-low for mid-February / Great Lakes ice at historic lows