Take a page from F.D.R.'s playbook, and join a modern-day Civilian Conservation Corps to help preserve our natural resources. Funding for national parks has been stretched in recent years, but organizations such as the Nature Conservancy, the National Park Service, Green Corps and local horticultural societies connect volunteers with opportunities to fill the gaps. Building trails, clearing litter, teaching kids about nature and lobbying for conservation are just a few of the many ways to get involved.