With time environmental issues got much more complicated. It is pretty easy, if you know what you are doing, to stop a company from pouring poison into a lake where kids swim. It is much harder to address all the myriad greenhouse gases emitted by different sources - from petrochemical refineries to hundreds of millions of peasants cutting down trees for their incredibly inefficient cook stoves.

I suppose I'd characterize myself as having a faith-based optimism. My faith is parental and Darwinian.

The more subtle thing is more speculative. The world is well past its long-term carrying capacity for human beings living a European, much less an American, lifestyle predicated on planned obsolescence. International economic growth is largely a matter of accelerated movement of materials from mines and forests to the dump. Instead of saving and buying decent furniture we can pass on to our children, we charge our credit cards for shaped heaps of sawdust and glue that fall apart in less than three or four years.

f the government is going to put money into the automobile sector, it should break up GM and Chrysler as a condition of financial aid, and it should be even-handed in its treatment of start-up firms like Tesla, Miles, Fisker, and others. It would be terrible to kill the entrepreneurs who have taken great risks to bring new automotive technologies to market by pumping tax dollars into the behemoths that have done everything wrong for the last years.

We shouldn't fuel the future with the polluting methods of the past, ... We have the technology to power our future in ways that don't threaten our health or poison our planet. Let's choose to use it.

That said, I'm embarrassed and furious that so many coal-state Democrats in the U.S. Senate are paralyzing international progress to protect the short term interests of a dying industry that ravages the environment from mine to slag heap.

By the year 2000, such renewable energy sources could provide 40 percent of the global energy budget; by 2025, humanity could obtain 75 percent of its energy from solar resources.