Time off: Pierre, who spends half the year in Brazil, tends to his organic "French cheese" farm.

FORBES: Europe

The brothers power their farm and cheese factory using an anaerobic digestion system, which turns organic waste into fuel, and cuts down on greenhouse gas emissions.

WHITEHOUSE: Council on Environmental Quality Blog

Over slices of bread and peanut butter Mr Keino enthuses over the cheese which is produced on the farm and even finds its way onto supermarket shelves in Nairobi.

BBC: Kenya's Olympic challenge

The Crave brothers, Charles, George, Thomas and Mark, showed us some of the ways they are using modern sustainable technology to power their farm and make tasty cheese at the same time!

WHITEHOUSE: Council on Environmental Quality Blog