Could 30-Story Wood Skyscrapers Be the Ultimate Green Building?

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So what exactly is Vancouver-based architect Michael Green thinking when he proposes using wood to erect urban skyscrapers and multifamily structures of up to 30 stories? “Earth grows our food,” he says in his 2013 TED Talk. “We should move toward an ethic that the earth should grow our homes.”
For one thing, Green argues, using wood in a more systematic way would be good for sustainability. Buildings account for nearly 50 percent of all global greenhouse gas emissions. In the construction process, 3 percent of the world’s energy is used for making steel, and 5 percent for concrete.