Mexico's prickly pear cactus: energy source of the future?

Mexico City

THE prickly pear cactus is such a powerful symbol in Mexico that they put it smack in the middle of the national flag.

It was considered sacred by the ancient Aztecs, and modern-day Mexicans eat it, drink it, and even use it in medicines and shampoos.

Now scientists have come up with a new use for the bright green plant: producing renewable energy.

Instantly recognisable with its jumble of spiny discs - its bright red fruit protruding like fat fingers from each one - the prickly pear cactus is farmed on a massive scale in Mexico.

Its soft inner flesh plays a starring role in a plethora of favourite national dishes: tacos, soups, salads, jams and even candies.

Believed by some to have healing powers, the cactus is also used in blood-pressure medications, anti-hair loss shampoos, sk…