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