People opposed to action on global warming use three arguments most often: global warming is not caused by human activities, reducing CO2 will slow economic growth and really it's just an excuse for eco-liberals to create a neo-fascist nanny state to run everyone's life in an irritating and politically correct fashion.

There isn't much I can add to the debate on the first issue, but let's talk about the other two, with the help of the graph above which I found at the Canadian Green Party website.

We'll see that reducing CO2 by increasing energy efficiency improves the economy and that 'nanny' laws work when the free market doesn't.

That blue line going down shows the dramatic improvement in the energy efficiency of refrigerators in the US since 1973. That pinkish line rising tells an opposite story -- of the dramatic rise in standby power over the same period.

Together they tell a couple stories: one about vampires, the other about nannies.

We have come to a point in the election season where the courage of the candidates and the intelligence of the voters are being severely tested. So far, the candidates are flunking. The public’s grade is pending.

The test is about oil and national security.

Shares in Denmark's Vestas -- the world's #1 wind turbine maker -- shot up 8 percent last Friday on news that the company had an order backlog worth $10.7 billion. The backlog grew 67 percent since a year ago -- a strong indication of continued robust growth.

The company also announced it was investing $120 million in a new factory in Colorado -- on top of $200 million it's already sinking into another factory -- which will bring 1350 new jobs to the state. That is going to put a total of 2450 people on the Vestas payroll in Colorado.

It's nice that this Danish company that owns a 25% market share in wind turbines globally is outsourcing clean tech jobs to the US, ain't it?

The best part, though, is that the development is playing into the volatile energy politics of the state. As renewable energy takes on a new attractive luster, incumbent oil and gas industries in Colorado are being rocked back on their heels.

Might this be the preview of a larger national drama?

An old friend of mine used to say that at a certain stage in political campaigns, dead cats start flying through the air.  I’ve never understood what he meant by that, but I think the cat-flinging has begun.

Both candidates are doing their share, but one exchange deserves special analysis: John McCain’s attack against Barack Obama’s comment about tire gauges. In one of his recent energy speeches, Obama made the point that acts of conservation by individual Americans can have an impact on rising oil prices. He used tire pressure maintenance as an example.

An old friend of mine used to say that at a certain stage in political campaigns, dead cats start flying through the air.  I’ve never understood what he meant by that, but I think the cat-flinging has begun.

Both candidates are doing their share, but one exchange deserves special analysis: John McCain’s attack against Barack Obama’s comment about tire gauges. In one of his recent energy speeches, Obama made the point that acts of conservation by individual Americans can have an impact on rising oil prices. He used tire pressure maintenance as an example.