Can we trust the ecological footprint?
Do we know enough about biodiversity to prevent widespread extinction of plants and animals in the coming century?
Can we trust "the" ecological footprint? As a concept - sure. It is the calculation that some might question. Where do we draw the boundaries? Let us consider something like a car. The making of a thing (like our car) involves various materials and technologies. The ton or so of metals involves almost 10 times that amount in ore(assuming raw metals) and more than that in coal for energy to smelt the metals (and as metallurgical "coke" to allow air flow and electron exchange) Sand for the glass (and energy again), petroleum for plastics (and more energy). These are the inputs and pretty easily defined. Then we ...
The expert discusses the various parameters of the idea of an ecological footprint.