EXPO approach to architecture

The Cradle-to-Cradle approach aims at a kind of design as a regenerative force.

http://www.mcdonoughpartners.com/design-approach/

Visit the link above and then answer the following questions:

1. What's the vision of this design firm which has coworked at realizing EXPO 2015?

2. Who's the founder of the cradle-to-cradle philosophy?

3. What does this philosophy imply?

4. How are materials considered according to this philosophy?