Is your excuse for not having a Porsche that it's just an environment unfriendly machine? (Even though your bank manager can come up with another valid reason...) Why not build a sustainable one your self!
The artist Hannes Langeder spent over 1,000 hours to make this golden Porsche by using tape, plastic pipes and aluminum foil. This doesn't sound too green yet but considering that this Porsche runs on manpower instead of horse power, it actually is much better for the environment than most other cars! And if you decide to do long hauls; you will even end up more fit than most other Porsche drivers!
See for instruction photos below, and please do send me photos of your car if you decide to make one yourself! I promise I will post them!
More info:
911 Nation