There's been a lot of drama in F1 lately. Most of the teams are fed up with the current state of affairs and want a more team-friendly structure. There's been a lot of talk of a breakaway series with Ferrari, McLaren, Brawn GP, Renault, Toyota, Red Bull and Toro Rosso.
One of the major complaints (apart for the money) is that most of the time is spent circumventing new rules rather than innovating.
What about an environmental series? The rules would be largely similar to the current F1 rules with respect to the dimensions and weight of the car.
Aerodynamics should be without constraints; as long as the car is the minimum width, height and length anything goes. Crash testing is mandatory (as it is today).
Suspension technology is without constraints. Active suspension? No problem. Leaf springs and rubber? Go ahead!
The one big rule should be: No fossil fuels. All energy must be harvested during the weekend. The car should be able to drive at least 100 km between refuels. Energy can be harvested by the car during the race. Race distance is the same as the current (305 km).