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Wouldn't argue against that (link is behind a paywall btw).
Not convinced the oil price is a major issue for oil consuming countries apart from the short-term overall deflationary effect it is helping with. Might become more interesting in a couple of years however when demand again outstrips supply.
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"when demand again outstrips supply" Theoretically we should already be there with fighting in Iraq, Syria and Libya hitting production; but we are not!
Demand is falling in China although they like other countries have taken the opportunity of lower prices to build up their strategic reserves but soon, maybe already, they will have filled up every possible "container" and then demand from them will fall again.
Whatever one thinks about global warming it is clear that there is a lot of interest and investment in renewable energy sources.
Germany is rapidly moving in this direction and already claims to produce over 30% of their electricity needs from renewable energy sources.
Worldwide it is claimed commercial solar power plants have a combined capacity of over 6 gigawatts (GW).
Currently solar is a relatively inefficient converter of solar to electricity; most commercial systems offer around 8% to provide a reasonable sale price of the solar panel.
30% is possible today but the panels cost about 100 times more.
Clearly any small efficiency gain would be a major improvement and lead to much wider usage.
A small piece of anecdotal evidence; I was surprised to see a large solar farm (799 kWp) behind the new Migros in Eglisau.