Glacial retreat: Ecuador's environmental timebomb | John Vidal | Global development | guardian.co.uk

Glacial retreat: Ecuador's environmental timebomb | John Vidal | Global development | guardian.co.uk

The Cayambe volcano lies dead on the equator line in Ecuador and is the third-highest mountain in all the Americas at 17,159 ft (5,230m). It is really only climbed by serious "Andenistas" - as opposed to Alpinists - because of its crevasses and icecap, so the great Guardian/Oxfam climate expedition stopped at a modest 4,675m (14,250ft), which is nearly the height of Mont Blanc.

Where, just 25 years ago, there had been a three-kilometre long, 60-metre thick avalanche of ice, tumbling off the peak, we gazed down on bare, black rock. A whole valley once filled with ice was mostly empty. The snout of the glacier was 1,800 ft higher than it had been.