Architect and designer William McDonough explains his philosophy of "cradle to cradle" design, which bridges the needs of ecology and economics. He brings up some interesting thoughts like these:
Talking about the power and elegance of trees.
"Designers --imagine this assignment.
Design something that:
makes complex sugars in food
changes colors with the seasons
Why don't we knock that down and write on it?"
Why we need humble design:
"It took us 5000 years to put wheels on our suitcases!"