Many dead or fallen trees in Philadelphia face an unglamorous fate as wood chips or mulch. But now, the city has bigger plans for some of its wood waste: Mill it into building material — and rake in some of the profits to support Philadelphia’s urban forestry plans. Here’s how Philadelphia’s recently launched “reforestation hub” works, according to Marisa Repka, co-founder of Cambium, Philadelphia’s partner in the project: Waste logs and branches from across the city are brought to an existing organics recycling center. Suitable logs are processed at an on-site sawmill operated by Cambium. The company finds buyers interested in sustainable wood products, from furniture manufacturers to architects, and gives 15% of the profits to TreePhilly, the city’s urban forestry program.