What is a Transition Town?

I haven't explained what Transition Town means — thanks Elizabeth! A quote from the Transition Town site…

A Transition Initiative is a community (lots of examples here) working together to look Peak Oil and Climate Change squarely in the eye and address this BIG question:

"for all those aspects of life that this community needs in order to sustain itself and thrive, how do we significantly increase resilience (to mitigate the effects of Peak Oil) and drastically reduce carbon emissions (to mitigate the effects of Climate Change)?"