Michael Dudley

Plans for a massive new Pentagon-sized Homeland Security complex threaten to ruin one of the finest vistas in Washington, D.C.

A new United Nations report states that while the world's desert cities are threatened by climate change and water depletion, they may also benefit from new investments in solar energy projects.

With a footprint as big as New York City but with a tenth of the population, and with no natural limits on growth, Calgary struggles to rein in suburban sprawl.

While cities that have never suffered terrorism are receiving large increases in homeland security funding, New York City's allocation is being cut by 40 percent after faulty analysis omits reference to iconic sites, critics charge.

Alfred Runte, author of "Allies of the Earth: Railroads and the Soul of Preservation", calls on the United States to revive its passenger rail service in order to conserve energy and preserve the natural landscape.