Russ George knew how to fight global warming: Grow rainforests' worth of plantlife in the open ocean, plantlife that would suck carbon dioxide from the atmosphere. He had the boat, the money and the team to make it happen. Everything was going according to planâthat is, until the environmentalists mobilized

Visting the Green Megalopolis

To rescue the Earth, we need bold engineering ideas that go beyond simple recycling

A homebuilt tumor killer, one-wheeled motorcycle and more

Archaeologists are using satellites and high-tech radar to unearth ancient civilizationsâand avoid landmines along the way

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