Has the American TV audience finally had it with reality shows’ bad eggs, and will it instead tune in to people doing good?

ABC banked on that pendulum swing last March with Oprah Winfrey’s Oprah’s Big Give, wherein 10 fledgling philanthropists vied to change the lives of complete strangers by giving out cash in the most effective and outlandish ways (the premiere attracted some 15.6 million viewers). And Discovery Communications’ Planet Green, an environment-themed digital and satellite cable...

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