Although there's plenty of development work on alternative fuels and power plants going on in U.S. automakers’ R&D labs, the industry is consumed these days with fixing its collective financial woes and there's not much noise being made about advancing green technology. Not in the U.S., anyhow.

We likely won't hear too much about what's close to being market ready until the carmakers and the UAW complete their ongoing master contract negotiations and possibly not until the hype around January's Detroit auto show begins.

But Asian and European car companies, including European subsidiaries of both Ford and GM,  are stepping in to fill the environmental void, with a spate of clean diesels and gas-electric hybrids in the works. A lot of green goodies will be shown off at the 2007 Frankfurt Auto Show, which begins a two-day press preview on Tuesday.

Here's a look at what's on tap.