The Loss of the Great American Grasslands / / No Comments The Cornell Lab of Ornithology and the Act for Grasslands. have teamed up to map the loss of grasslands in the United States. Over 2 million acres of American grasslands are lost on average every year. The result of which has a devastating effect on American wildlife. Using historical satellite records Map for Grasslands has tracked grassland loss in the USA over the last 30 years. By Maps Mania… more → Posted in: Interactive Maps Tagged with: American, Grasslands, GREAT, Loss