Volunteers with the group Globe Aware dig a trench to lay a water pipe in Costa Rica.
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As the industry grapples with how to make money without compromising the results of the volunteer work, one thing is clear: more and more private citizens are ready to roll up their sleeves and lend a hand. "I was just so sick of just donating a gift at the end of the year," says Yates of his decision to spend a week volunteering in Costa Rica. "I worked my butt off."