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Heres a program from our archives.Earth Day - The PledgeAmbience: Sand Hill Cranes On today's program, in honor of Earth Day, the sounds of migrating Sand Hill Cranes, and some thoughts from Denis Hayes, chairman of Earth Day, 1990. I'm Jim Metzner and this is the Pulse of the Planet. Hayes: There are very few movements that have as many opportunities for substantive personal involvement that has a direct consequence as the environmental movement, and we think that an environmentalist who recycles, an environmentalist who drives a fuel efficient automobile, eats lower on the food chain, has a well insulated house, is one who will stay in the fight for the long term and will be more effective than an environmentalist who merely sends off twenty-five dollars to some organization twice a year, and thinks that he or she has fulfilled their responsibilities."As part of their efforts to raise the level of environmental awareness, the organizers of Earth Day have circulated a pledge, and they hope as many people as possible will sign it.Hayes: We're trying to get a number of people who have not in the past thought of themselves as environmentalists to start now dipping their foot in the water, to make a commitment to integrate environmental values throughout every aspects of their lives, the kinds of products that they buy, the actions that they take in their workplaces, the investments that they may hold, the way that they vote. It's a relatively simple straight forward pledge, one that I think most people will be very comfortable with, but that will get them starting to think about the real impact that they have on the world around them.More on Earth Day in our next program. The Sand Hill Cranes were recorded by Ann Keech. This archival program is part of our thirtieth anniversary celebration. If you want hear more, check out our podcast. Im Jim Metzner and this is the Pulse of the Planet.