I watched a brief video on Motley Fool last weekend to the effect that Tesla Motors is a good investment while Zipcar has probably grown to its upper limit within walkable urban cities. But I'd be concerned about the bricked Roadster battery reports, which are getting fierce on both sides. A dogpile search shows dozens of stories like "Tesla Downplays Danger of Bricked Battery" and some that ridicule anyone that wouldn't already know that batteries will discharge. Meanwhile, self-proclaimed experts on Slashdot swear that LIon batteries couldn't possibly be fully discharged because they found an old cell phone once and recharged it.

In UT: No Evidence of Groundwater Contamination from Hydraulic Fracturing, Rigzone lets fracking off the hook:
 

No direct connection has been found between hydraulic fracturing and reports of groundwater contamination, according to a study released Thursday by the Energy Institute at The University of Texas of Austin.

The study found that many of the problems linked to hydraulic fracturing are related to common oil and gas drilling operations such as casing failures or poor cement jobs.

Researchers also concluded that many reports of contamination can be traced to above-ground split or other mishandling of wastewater produced from shale gas drilling, rather than hydraulic fracturing per se, said Charles "Chip" Groat, an Energy Institute associate director who led the project.

"These problems are not unique to hydraulic fracturing," Groat said in a statement.

The video above efficiently trims the discussion to one hour. The debate proceeded as I expected.