Go back into the history of grand prix racing, and the only green you'd expect to see was the color of a British racing car and the vast quantity of cash injected into the sport. But today, Formula One is a different scene, thanks in no small part to a push by the FIA for a more environmentally friendly form of motorsport. Just take a look at the on-again, off-again implementation of regenerative braking and the limitation on everything from fuel to tires.
That push is set to take a big step forward (or backward, depending on who you're talking to) when the current high-revving V8 engines are replaced by 1.6-liter turbo sixes in 2014. But that's not the end of the changes. The FIA has just published further modifications to the regulations, which will now include the necessity for F1 cars to run entirely on electric power for the entire time they're in the pit lane.
According to Rule 5.19 of the revised technical regulations (which you can find in PDF form here), "The car must be run in electric mode (no ignition and no fuel supply to the engine) at all times when being driven in the pit lane." The new rules, which come into effect together with the new engines in 2014, also mandate the inclusion of on-board ignition (as opposed to the external starter motors used currently).
In order to accommodate electric-only propulsion in and out of pit lane, the new Energy Recovery Systems have been increased in capacity to 120 kW, and they will also be allowed to recapture energy from exhaust fumes as well. Unfortunately, that also means waving goodbye to the high-pitched whine of the engine holding at the pit-lane rev limiter every time it goes in for fresh rubber, but as they'd say at FIA headquarters in France, c'est la vie.