"They fall all over the Earth, not just Antarctica, but the best places for us to find them are the deserts because they don't get weathered and they don't break down as easily."

VOA: special.2010.07.28

The first of those, in July and August, however, is in Sri Lanka, against a team on the wane on pitches that aren't quite the slow deserts they once were.

WSJ: Just One More Peak to Conquer

They can grow in the most hostile of regions such as deserts so don't infringe on land set aside for food crops.

CNN: All about algae: Can pond scum power our future?

Scientists aren't sure if the world's deserts collectively are growing, but the boundaries of some are in flux.

FORBES: A Desert Where?