There are innumerable ways one can lessen their impact on the plant, but ever wonder which methods are giving you the most green for your buck? Like, is it better to buy organic groceries if it involves a fifteen minute drive to the farmers market, or should you forgo the wheels and huff it to the nearest non-organic supermarket produce aisle? Or what uses less energy: turning off one light for an hour or unplugging your cell phone charger for the day?

David MacKay, a professor at the University of Cambridge breaks down these often incomprehensible calculations by converting it all into Kilowatt-Hours, and providing an online guide of the efficiency trade-offs in his new (and free!) volume titled Sustainable Energy: Without Hot Air.

takepart at withouthotair.com and do your own green calculations to find out how to get the most out of your own green initiatives.

via Treehugger

Related:

• Flying the (*Cough* Hack*) Unfriendly Skies?
• David MacKay: Sustainable Energy – Without the Hot Air
• TreeHugger: Six Minutes Driving = One Bath