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An Ecotron is a device that enables scientists to simulate several climate parameters and control them to study miniature versions of given ecosystems. A team in France decided to study Arizona savannahs. Locked in hermetic climate chambers, they analyse different plants from the savannah after accurately calibrating the surrounding light, the irrigation system, and the composition of the atmosphere. Thanks to the collected data, the team will be able to forecast the ecosystem's reaction to any climate in the future, as well as determine its role in global warming.