A new engine from Revetec is half the size and weight of a traditional engine, and has 50 percent fewer emissions.

A porous rock layer filled with saltwater that underlies much of the Midwest could permanently store half of the greenhouse gases released in the next century by industries in Ohio and neighboring states.

In five years' time, we could be living in a world where millions are dying in famines with no food aid to hand, regular storms and droughts wipe out acres of crops, and skyrocketing food prices have created global political panic, food experts say.