17xM, a 334,000-square-foot, 11-story building at 1150 M Street, N.W., includes a two-story, 1,500-square-foot, self-watering green wall of living plants. 17xM includes a two-story, 1,500-square ...
About two decades ago, African nations launched an audacious plan: a 7,700km “Great Green Wall” to hold back the Sahara Desert’s southward march. Yet years passed and progress was stalled ...
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