ne hot, windy day last summer, Daniel Janzen leaned in through the window of an open-air schoolhouse in northwestern Costa Rica and called to the teacher. The teacher left the blackboard, where he had been working a math problem. After chatting with the teacher for a few minutes in Spanish, Janzen handed him a photocopied note inviting the elementary school students to attend a speech by Costa Rican President Oscar Arias Sanchez in which Arias was to reaffirm conservation as one of the nation's top priorities. The speech would be given at nearby Santa Rosa National Park, where the class had already studied natural history as part of a new educational program. The invitation was delivered to several other elementary schools in the region, as well as to farmers, politicians, and other local residents.
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William H. Allen (1988) studied this question.