The difference that two generations can make! Very thought provoking piece presented in a very straightforward and easy to absorb method. “even the hardcore in the green movement use a washing machine”. How to understand the future energy needs of 9 billion people by 2050. Easy to grasp but not so easy to solve. Truly something to ponder. “Until the high energy users have the same consumption as low energy users, they should not give advice to others on what to do and what not to do”.