Barely a week goes by without new evidence of the greening of China. This is great news for the planet -- but some people say it's bad for the U.S.

Are they right to worry?

What got me thinking about this was a phone conversation the other day with Bill Gross, the brilliant and tireless entrepreneur who is the chief executive of eSolar and a founder of electric-car startup Aptera.

Bill was calling with great news for eSolar, a Pasadena, Ca-based firm that makes software and equipment for utility-scale solar thermal power plants. This weekend in Beijing, eSolar announced a deal with a Chinese electrical-power manufacturer to build at least 2 gigawatts (2,000 megawatts) of solar thermal power plants over the next 10 years, beginning with a 92-megawatt plant that will break ground this year.

"China is really moving fast to implement as many green technologies as they can, to become experts at them and to scale them up," Bill told me. "It's a statement that China is thinking about clean energy for the long term."

I'm hearing this more and more. Tulsi Tanti, who runs a big Indian wind power company called Suzlon, told me last month in Copenhagen that China is his biggest market. My blogging colleague Jesse Jenkins (at The Energy Collective) has written about a report from the Breakthrough Institute, where he works, called Rising Tigers, Sleeping Giant (available here as a PDF) that argues, among other things, that:

Asia's rising "clean technology tigers" -- China, Japan, and South Korea -- have already passed the United States in the production of virtually all clean energy technologies, and over the next five years, the government's of these nations will out-invest the United States three-to-one in these sectors.

It also says:

If the United States hopes to compete for new clean energy industries it must close the widening gap between government investments in the United States and Asia's clean tech tigers and provide more robust support for U.S. clean tech research and innovation, manufacturing, and domestic market demand.

The New Yorker just published a long story about clean tech China called Green Giant. And this week in The Times, Tom Friedman tackles the issue again, saying:

I've been stunned to learn about the sheer volume of wind, solar, mass transit, nuclear and more efficient coal-burning projects that have sprouted in China in just the last year.

We are either going to put in place a price on carbon and the right regulatory incentives to ensure that America is China's main competitor/partner in the E.T. revolution, or we are going to gradually cede this industry to Beijing and the good jobs and energy security that would go with it.

Note Friedman's use of "competitor/partner." That's the question, isn't it: Is China a competitor or partner or both?