Bruce Stutz

After spreading across Pennsylvania, fracking for natural gas has run into government bans in the Delaware River watershed.

When it comes to ecosystem services, freshwater mussels have much to recommend them:

With sea levels rising, coastal communities…in the U.S. and Europe are realizing the value of wetlands as important buffers against flooding and tidal surges.

As economic activity and populations continue to expand in coastal urban areas, particularly in Asia, hundreds of trillions of dollars of infrastructure, industrial and office buildings, and homes are increasingly at risk from intensifying storms and rising sea levels.

Long a proven technology in Europe, green roofs are becoming increasingly common in U.S. cities, with major initiatives in Chicago, Portland, and Washington, D.C. While initially more expensive than standard coverings, green roofs offer some major environmental — and economic — benefits.