Here is a studio from Italy with interesting interpretatins of sustainable design.
From their website www.studiomobile.org:
studiomobile conceives the design as a multitasking field where architecture mixes with urban planning, concept design and marketing strategies. It is mobile because it uses different skills and drive their overlap.
studiomobile researches in green architecture, sustainability, renewable energies and passive systems. Designers have much to say about a sustainable future, we can't build dinosaurs anymore
I strongly reccomend the romantic-but-true movie about guerilla gardens in Barcelna: ¡¡Hasta la verdura siempre!!
And various projects reinventing the farm concept:Kinetic field http://www.studiomobile.org/works.php?id=28&name=Kinetic+Field
Jellyfish farm
Cloud farm
Victory garden
Seawater vertical farm