These images, acquired by the Envisat satellite, show algal blooms in Lake Erie. The first image captures the largest algae bloom in 2011, which extended from Toledo to beyond Cleveland and along the Ontario shore. The subsequent images illustrate the algal blooms in the years 2008, 2005, and 2003. The last image is a collage that depicts changes in Lake Erie from October 2002 to October 2011.

• Image 1: Satellite: Envisat, Product: MERIS_FR_1P (level 1b full res), Instrument: MERIS (300 metre resolution), Coverage: 575 km x 575 km, Acquisition Date: Oct 2011, Orbit number: 48159, Band Combination: 7, 5, 2 (RGB)
• Image 2: Satellite: Envisat, Product: MERIS_FR_1P (level 1b full res), Instrument: MERIS (300 metre resolution), Coverage: 575 km x 575 km, Acquisition Date: 17 Sep 2008, Orbit number: 34248, Band Combination: 7, 5, 2 (RGB)
• Image 3: Satellite: Envisat, Product: MERIS_FR_1P (level 1b full res), Instrument: MERIS (300 metre resolution), Coverage: 575 km x 575 km, Acquisition Date: 16 Apr 2005, Orbit number: 16365, Band Combination: 7, 5, 2 (RGB)
• Image 4: Satellite: Envisat, Product: MERIS_FR_1P (level 1b full res), Instrument: MERIS (300 metre resolution), Coverage: 575 km x 575 km, Acquisition Date: 12 Apr 2003, Orbit number: 05834, Band Combination: 7, 5, 2 (RGB)
• Image 5: Satellite: Envisat, Product: MERIS_FR_1P (level 1b full res), Instrument: MERIS, Acquisition Dates: October 2002 - October 2011, Band Combination: 7, 5, 2 (RGB)