The thing that bothers me about the green challenge is that it's totally unfathomable by the viewer. I mean, look at this:
Quote:
* Performance Energy Coefficient (the amount of energy used): [total normalized fuel consumption during race] \ [1,000,000]
* Greenhouse Gas Coefficient (the amount of greenhouse gases emitted): 3 * [ (upstream C02) + (downstream C02)]
* Petroleum Fuels Displaced: Y * [ (upstream petroleum energy) + (downstream petroleum energy)]
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Who's gonna work that out while following a race?
On the other hand, it's certainly not a bad idea and there's probably no way to make it more understandable while keeping it credible and not just the equivalent of a few green stripes on a tire.