For both trees and people the underlying scientific principle is the same: when water evaporates, that is, changes from a liquid to a gas, it takes heat energy from the surrounding environment, thus leaving its environment cooler.
(water; evaporates; ) (it; takes; heat energy; from the surrounding environment; T:when water evaporates) Context(it takes,List([139, 147))):(the underlying scientific principle; is; the same) Context(it takes,List([139, 147))):(it; takes heat energy leaving; its environment cooler)
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its environment cooler