Long-term Ecological Experiments
The US National Science Foundation supports a number of long-term ecological experiments, mostly in ecosystems that are less directly impacted by humans than most agricultural ecosystems are. See LTER.
A number of other areas, sometimes called involuntary parks, can be regarded as long time ecological experiments, because they have been abandoned by humans and returned to near-feral condition. These include areas abandoned for political reasons, such as the Korean Demilitarized Zone, or environmental contamination, such as the Chernobyl Nuclear Power Plant Exclusion Zone.
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