Eco-photos of the week: April 26-May 2

A new racing car made of vegetables and powered by chocolate will hit speeds of 145 mph when it's launched next month. Designers hope the environmentally friendly technology will be adopted by Formula 1 teams such as McLaren and world champion Ferrari. The car, named ecoF3, has a potato body and soybean seats. It uses plant-oil-based lubricants and a biodiesel engine capable of running on chocolate and vegetable oil. Vegetable fibers are mixed with resins to produce the car parts and the oils in the chocolate are refined to produce fuel. It is the first Formula 3 racing car designed and made with sustainability in mind.