New York - James Hansen, one of the world's leading climate scientists, will today call for the chief executives of large fossil fuel companies to be put on trial for high crimes against humanity and nature, accusing them of actively spreading doubt about global warming in the same way that tobacco companies blurred the links between smoking and cancer.

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That's a good thing, though the CFTC is not exactly the most aggressive regulator around. (Says Judy Dugan of Consumer Watchdog: "On its face, the investigation smacks of the fox investigating a hen shortage in the chicken coop.")

Market manipulation may be contributing to the recent oil price spike -- though even in the worst case, it is only part of the story. The most important factor is supply and demand: supply is having trouble keeping up with unabated demand growth.

Are Wall Street firms and hedge funds in fact manipulating the oil market? Perhaps. There are certainly enough conflicts of interest, and unregulation, to make such activity plausible. These aren't exactly guys with an honorable track record.

Whether speculation is driving price up is a separate issue from manipulation. Investment dollars are pouring into oil futures, pretty clearly driving up price. This reflects supply and demand for oil futures as an investment tool, more than available supply and demand for actual crude oil. Some nontrivial portion of the recent run-up in price is almost certainly due to this speculative activity, which is fueled by leveraged buying (use of borrowed money).

At the end of 2007, with oil prices around $100 a barrel (a shocking height, just half a year ago), Jennifer Wedekind, my colleague at Multinational Monitor, interviewed roughly a dozen oil analysts about the price of oil. They were divided on the reasons for high oil prices of $100, with some agreeing that speculation -- but not manipulation -- played a role and others fiercely denying it.

Among those attributing some role to speculation was Linda Rafield, a senior oil analyst, with Platts: "We have seen money market funds and asset managers and portfolio managers definitely putting money to work in the commodities sector, and that certainly has bolstered prices, since most of those people notoriously will trade from the long side." Against speculation as a factor was Jeff Rubin, chief economist and chief strategist, CIBC World Markets. Asked what factors were driving the price spike, he said, "Certainly not Middle Eastern instability or speculation or so-called geopolitical factors."

Six months later, it seems like speculation has become increasingly important. It's just very hard to identify what has happened in the last half year to jump prices by a third.

A second key factor in rising prices is the decline in the value of the dollar. A barrel of oil today is worth a barrel of oil tomorrow. If the dollar is worth less tomorrow than today, then the dollar value of a barrel of oil will be higher tomorrow. Against a basket of currencies, the dollar has fallen by 25 percent since 2003, and considerably more since its peak in 2001.

But, whatever the allocation of blame for today's price, the most important factor in the big picture is supply and demand.

Global demand is growing at a steady clip, thanks to very rapidly rising oil use in China, India and the Middle East.

Global supply is stretched thin. Some argue this is because the world is at or near "peak oil production," a tipping point when half the world's oil has been extracted, and yields begin to decline, with very major price effects.

A different view is uncomfortable with the apocalyptic element of peak oil theory. From this vantage point, more oil -- or close substitutes, like tar sands or shale -- is available, but it is harder and more expensive to get. This is the preferred view of the oil industry analysts (many of whom note that much oil that is easily attained from a technological standpoint -- for example, in Iraq -- is hard to reach for political reasons).

Either way, the supply challenges combined with rapidly growing demand means the world is going to see steadily higher prices. Additionally, very tight supplies will inevitably lead to price spikes that appear irrational from a close-up view.

Says Charles Maxwell, senior energy analyst at Weeden & Co: "So long as capacity utilization in the world crude oil producing system is running at 98 percent, which it is today, and so long as perhaps one-and-a-half, 2 percent, that's excess, is in the form of Saudi heavy, sour crudes, which the typical American refinery can't use any more of -- they use some, but they can't use any more of because it has very serious effects in pitting the insides of these pipes and then requiring the refinery to shut down for a long time and the redoing of all the pipes -- we're going to have these periodic price rises of this sort."

Explains Maxwell: "Any system needs to have a little cushion between adversity that strikes -- weather factors or cut-offs for political purposes or political struggles from civil wars. We don't have in this system enough of a cushion. Normally, capacity utilization is considered ideal around 94 to 95 percent. So our 98 percent capacity utilization is well above that and we can't get it down, because it takes 5 to 7 years to create it and we aren't spending the money today that would create it 5 to 7 years out."

So, by all means, forward with a robust investigation of market manipulation, and yes to re-regulating oil markets that are now too financialized and removed from the buying and selling of real oil.

But the supply-demand challenges facing the world are much more serious than the speculative and other factors contributing to the present run-up in price.

It's hard to imagine why the United States -- or the world -- would need more incentive than responding to climate change to invest in renewables, mandate much tougher efficiency standards for cars and a switch away from the internal combustion engine, and massively scale up public transportation. But climate change doomsday scenarios have, so far, not proven enough. Perhaps the prospect of $200/barrel oil will.