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trees × 14carbon-sequestration × 4
carbon-offsetting × 3
carbon-footprint × 2
climate-change × 2
co2 × 2
recycling × 1
environmental-impact × 1
food × 1
pollution × 1
city-living × 1
building-materials × 1
plants × 1
air-pollution × 1
economics × 1
soil × 1
wood × 1