Does the moon hold the key to the earth’s energy needs?

Tidal power is the only renewable source derived from the moon. Now an extraordinary array of devices promise to unlock this vital energy potential

Using giant kites, blades and paddles, and mimicking pogo sticks, blowholes and even the human heart, groups around the world are on the cusp of harnessing the colossal power of the oceans.

The challenge is huge - seas have been battering coasts and sweeping sailors to their doom for millennia - but so is the prize: huge amounts of clean, reliable and renewable electricity for an energy-hungry world.