There is no wave without wind.                  -- Chinese Proverb
无风不起浪
There is no smoke without fire.
Overview
Listening and discussion   EnergyReading and language   A dream of hydrogen economyBusiness skills        Problem-solvingCase study        Energy saving at Supersun
Discussion
A
Discuss these questions
1. Which one of these devices is not essential in your life?the planethe carthe mobile phonethe computerthe fridgethe televisionthe liftthe light bulbthe mocrowave oventhe washing machine