“...fossil fuels are forms of energy in which great quantities of space and time, as it were, have been compressed into a concentrated form. One way of envisioning this compression is to consider that a single litre of petrol used today needed about twenty-five metric tons of ancient marine life as precursor material, or that organic matter equivalent to all of the plant and animal life produced over the entire earth for four hundred years was required to produce the fossil fuels we burn today in a single year.”