So far as I know, the use of stereoscopic red-green wall-diagrams is rarely resorted to, yet they are extremely efficient and, within limits, are not difficult to produce. The details of the ...

China built its famous Great Wall to keep out marauders. Now, millennia later, a "Great Green Wall" may rise in Africa to deter another, equally relentless invader: sand. The proposed wall of ...

One of D.C.’s newest trophy office buildings now has the city’s biggest green wall. 17xM, a 334,000-square-foot, 11-story building at 1150 M Street, N.W., 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 ...