http://www.treehugger.com/bikes/us-cyclists-save-46-billion-riding-instead-driving.htm
Another 'made-up number' of course. Mix of not buying fuel, not getting cars serviced and various health benefits.
Stuff 'we' all understand to some extent.
But it's curious after a weekend where a few political leaders of quite well off countries agonised about how to get "growth".
Clearly that's $4.6 Billion that wasn't added to the US's GDP - unless it was spent on something more 'worthy'.
Perhaps the political difficulty of deciding between "austerity and growth" might cause some of them to think about whether they need to have a wider vision.
Perhaps not.