I thought everybody knew that.
The claim that tracer work gives expertise in the area of industrial work is illustrative of a poor comprehension of issues. I have seen this claim before, and I find highly illustrative. Handling a microscope slide that happens to have a few micrograms of uranium, for instance, confers no special knowledge about nuclear processing on a ton scale. None whatsoever. Filling a micropipet with 10 microliters of a tritiated nucleoside requires no understanding of the nuclear chemistry involved in the treatment of fission products and actinides. None whatsoever. A tracer experiment using sulfur hexafluoride neither confers nor requires and understanding even on a basic level of industrial processes in which the compound is used or for that matter, atmospheric chemistry. Absolutely none.
The assertion to the contrary is purely absurd on its face.
It is easy to rely on this kind of confusion in the case where solar PV energy is a trivial form of energy, which of course, it is. It is an example of what I call the "Nader syndrome." In 2000 people felt the compulsion to vote for Ralph Nader in spite of his near insanity precisely because they
knew his Presidency would not come to pass. They also made huge and frankly fantastic claims about his nobility - claims that would not and could not ever be tested and therefore were essentially
meaningless. It will never be known the extent to which this pixilated and self absorbed attitude resulted in the failure to seat the President-elected Gore, who by all evidence would have had an outstanding opportunity to have been an outstanding President. He would, in fact, have been the ideal man for these horrible times. Thus the effect or relying on "Ralph Nader" to create a higher probability of a liberal society had the exact
opposite effect: It lead to the near destruction of the American democracy in an orgy of dogmatic excess, the likes of which the United States has seldom experienced.
The claims about the benign nature of solar PV cell manufacturing are probably similar. The processes by which solar PV energy will become a
significant energy probably will never actually come to pass, certainly not in time to displace fossil fuels or the much more benign nuclear energy. Thus one can assert whatever one wishes to assert without having the question tested under
realistic conditions.
Here is an add for a 21 "watt" solar cell:
http://www.affordable-solar.com/unisolar-us21-21-watt-solar-panel.html This cell weighs 6.6 pounds, shipping weight or roughly 3 kilograms. The cell can be expected to operate at 20-30% loading capacity because of the existence of night and situations of diffuse light, so lets say that it will produce 8 watts of continuous power. Thus ignoring the need for batteries, this ad, one of the first to pop up when one "googles" "solar panel weight Megawatts" suggests that to produce 1 terawatt of electricity, one is required to handle 375 billion metric tons of mass and this for the
finished product. (Note that 1 terawatt of power is enough to produce about 32 exajoules of energy at continuous output - 100% capacity loading - roughly comparable to the worldwide primary energy output of nuclear energy.) The greenhouse gases involved in even
shipping this amount of mass is enormous - and we haven't even scratched the surface of the manufacturing cost, which is even greater. I note that for comparison purposes, the amount of spent nuclear fuel produced for
50 years of energy production via nuclear means, on an
exajoule scale is expected to reach 75,000 metric tons, a scale that is almost vanishingly
smaller.
I note that any (desperate) representation that uranium processing - and let's be frank, it's really nonsense in any case - is responsible for ozone depletion or, for that matter the bulk of CFC-114 pollution, represents similar confusion about the nature of mass balance and industrial processes, and, again, a complete lack of understanding of risk/benefit analysis. The energy density of uranium is vastly higher than solar PV energy, which is obvious to anyone who understands anything at all about energy.
But again, the point is moot.
No one would really object to solar PV energy becoming a significant form of energy, because, as I frequently point out, it is superior in any case to even the
best of the fossil fuels, which is natural gas, natural gas being, in light of global climate change, an unacceptably dangerous form of energy. In fact, solar PV, were it a significant form of energy would be well suited to meeting peak load capacity and
displacing the natural gas now used for peak power generation. This would be an attractive outcome, but I strongly object to anyone claiming - in a time of global climate
catastrophe - that what is
attractive is also
realistic.
In spite of the vast popular enthusiastic press for it, stretching over 50 years, solar PV energy has not produced energy on a scale approaching either nuclear energy or natural gas, never mind coal and oil. Thus far it has mostly been
talk and empty promises, decade after decade. In 2003, natural gas produced over 100 exajoules of primary energy.
http://www.eia.doe.gov/pub/international/iealf/tablee3.xlsThe entire renewable industry, including biomass, garbage burning, solar PV, geothermal etc (but excluding hydroelectric) was 1.1 exajoules. (I note that the solar PV industry is a trivial part of this production.)
http://www.eia.doe.gov/pub/international/iealf/table17.xls When the renewable industry is in a position to produce as much energy as
even the least dangerous of fossil fuels, natural gas, it will be worth regarding seriously as an option. Under these circumstances the true external cost will be known and
measurable. But that event, sadly, is not likely in the lifetime of anyone reading this. Thus it is
wrong to pretend that the
problem of global climate change is treatable through its agency.