![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)
The massive glacier that formed the Great Lakes is disappearing — and greenhouse gases are to blame for its untimely demise - Chicago Tribune
![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
![Frigid temps have accelerated ice coverage of Lake Erie; this satellite photo shows the ice - cleveland.com Frigid temps have accelerated ice coverage of Lake Erie; this satellite photo shows the ice - cleveland.com](https://cloudfront-us-east-1.images.arcpublishing.com/advancelocal/2T7UEANZRJHDPNELKZZSH5IDRA.jpg)