Here are the top environmental links folks are Digging today:

• ForceChange: "New 'Very High Speed' Train Goes 220 mph and Has No Centralized Engine"

— Currently undergoing certification testing in Europe, the trains have a series of motors under passenger cars, making them able to carry 20 percent more people.

The (London) Times: "Green-blooded frog makes first appearance for scientists"

— Discovered in a former Khmer Rouge stronghold in Cambodia, the well-camouflaged amphibians have translucent skin, turquoise skeletons and probably bad-tasting blood, scientists say.

National Geographic [photo gallery]: "TOP TEN PHOTOS: Most Viewed of 2008"

NG News rounds up its most popular photos of the year.

National Geographic [photo gallery]: "PHOTOS: Cyanide Millipede, Huge Spider Among New Species"

— A look at a few of the 1,068 new species discovered in the Mekong River Delta region from 1997 to 2007.

• PhysOrg: "The Green (and blue, red, and white) lights of the future"

— A new study predicts a "revolution" of light-emitting diodes, saying that switching to LEDs from other light bulbs over 10 years would save $1 trillion in energy costs and eliminate the need for nearly a billion barrels of oil.

— Russell McLendon