Two neat Web 2.0 innovations that aim to tackle long-standing environmental challenges:
Joulebug is an app that mashes game design, online community building and your typical household sustainability program. It's a smart and original idea that aims to make daily eco-actions fun, sharable and competitive.
[There's been a lot of talk lately about using game design to solve social and environmental problems - this is an example.]
The video explains it beautifully:
RecycleMatch is a website that borrows eBay's business model, but instead matches buyers and sellers of WASTE.