1 of 21
Red List of Ecosystems
Credit: chris.near | flickr
The International Union for the Conservation of Nature published 20 case studies illustrating its new criteria for a Red List of Ecosystems May 8 in the journal PLOS ONE.
The list, which measures an ecosystem's risk of collapse, will be similar to the group's authoritative Red List of Endangered Species, which created internationally accepted criteria for assessing extinction risk.
Here are the example ecosystems used to come up with the list criteria, from most to least endangered.