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The Union of Concerned Scientists puts rigorous, independent science to work to solve our planet's most pressing problems. Joining with citizens across the country, we combine technical analysis and effective advocacy to create innovative, practical solutions for a healthy, safe, and sustainable future.

Philly Tree People (PTP) is a volunteer-operated neighborhood-based non-profit organization dedicated to organizing tree plantings and maintaining the health of the urban forest in 19125 and 19134.