. Here too, companies clamor for our attention to prove their eco-gravitas. We've counted a few dozen press releases the past few days, but here are some of the more notable announcements we've seen.

On Earth Day, Philips will begin selling a $60 light bulb that uses just 10 watts of power. Before you balk at the price, consider the fact that it will last some 30,000 hours, some 30 times that of the standard light bulb. That's about 20 years, and each bulb is expected to save the consumer about $165 over its lifespan.

With the bulb, the company won the L-Prize, a Department of Energy competition to create an ultra-efficient light bulb. Don't worry about the $60 price tag though: In many cases, you'll get it much cheaper. Philips partnered with about 280 utility companies, some of which will offer rebates on the bulb, which will bring the cost down to about $25.