![Looking back: The ups and downs of Great Lakes ice cover in 2021 | NOAA Great Lakes Environmental Research Laboratory Looking back: The ups and downs of Great Lakes ice cover in 2021 | NOAA Great Lakes Environmental Research Laboratory](https://noaaglerl.files.wordpress.com/2021/04/great-lakes-january-average-ice-cover-1973-2021.png?w=950)
Looking back: The ups and downs of Great Lakes ice cover in 2021 | NOAA Great Lakes Environmental Research Laboratory
![Great Lakes Ice Cover Has Been Decreasing Since the 1970s, Study Says | The Weather Channel - Articles from The Weather Channel | weather.com Great Lakes Ice Cover Has Been Decreasing Since the 1970s, Study Says | The Weather Channel - Articles from The Weather Channel | weather.com](https://s.w-x.co/greatlakesice_0.jpg)
Great Lakes Ice Cover Has Been Decreasing Since the 1970s, Study Says | The Weather Channel - Articles from The Weather Channel | weather.com
NOAA Great Lakes Environmental Research Laboratory on Twitter: "#TransformationTuesday: Ice cover on the #GreatLakes is now up to 7.7%, almost 3x what is was at the beginning of last week! This is
![Looking back: The ups and downs of Great Lakes ice cover in 2021 | NOAA Great Lakes Environmental Research Laboratory Looking back: The ups and downs of Great Lakes ice cover in 2021 | NOAA Great Lakes Environmental Research Laboratory](https://noaaglerl.files.wordpress.com/2021/04/holland-lake-michigan-ice-february-2021-clarice-farina-collage.jpg)
Looking back: The ups and downs of Great Lakes ice cover in 2021 | NOAA Great Lakes Environmental Research Laboratory
![The massive glacier that formed the Great Lakes is disappearing — and greenhouse gases are to blame for its untimely demise - Chicago Tribune The massive glacier that formed the Great Lakes is disappearing — and greenhouse gases are to blame for its untimely demise - Chicago Tribune](https://www.chicagotribune.com/resizer/5oiSp7X1wax-ySWxw9yLzXoyHJw=/1200x0/top/arc-anglerfish-arc2-prod-tronc.s3.amazonaws.com/public/DB2KELMDNRB65DIOJ6ZAGM72QQ.jpg)