And another idea that I had as well, that was brought forward by an ecologist -- he basically did a calculation where he took one liter of gas and said, well, how much carbon it would take, and how much organic material?
Outra ideia que também tive, que me foi sugerida por um ecologista — ele, basicamente, fez um cálculo em que pegou num  litro de gasolina e disse: "Quanto carbono utilizaria e quanto material orgânico?"