Could be a matter of embodied energy. Growing trees, when done right, comes with a free CO2 sink (not enough to off-set the CO2 produced in harvesting and proce

Could be a matter of embodied energy. Growing trees, when done right, comes with a free CO2 sink (not enough to off-set the CO2 produced in harvesting and processing, but it still helps). Metals can be very energy-intensive to refine, even from recycled metals.