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?
我还有一个想法， 是由一位生态学者提出的。 他计算了一升汽油需要耗费多少碳、多少有机物质。 他计算了一升汽油需要耗费多少碳、多少有机物质。 他计算了一升汽油需要耗费多少碳、多少有机物质。