Tom Cain of SAIL Venture Partners, one of the first energy VCs, reflects on his firm's investment criteria and portfolio companies.

Public cleantech companies tumbled this past quarter. But less so than other sectors, according to the manager of the CTIUS index.

The oil the USGS says is in them thar North American hills doesn't undermine cleantech initiatives.

Cleantech companies need to watch out for this year's H-1B visa lottery and quotas, warns immigration law firm Jackson & Hertogs.

With food costs rising, Lester Brown says it's time to ask if the fuel value of grain is really worth more than its food value.

Don't reinvent the wheel — cleantech startups should engage E&Cs.

Patents in the biofuel sector dominated renewable energy in 2007, and there are more on the way.

Can water borrow go-to-market lessons from other cleantech sectors? Laura Shenkar thinks so.

To what do we owe the spectacular performance of cleantech last year? And is more of the same coming?

Enjoyed our "seven for 2007" roundup? Here’s Cleantech Group Chairman Nicholas Parker on eight trends to watch for in 2008.

Cleantech companies, like others, have differing views on the role of business development. Simon Gall offers his perspective.

If the American economy is having problems, how are U.S.-traded cleantech companies posting such impressive returns?

The world is running out of excuses for not investing in cleantech, writes Keith Gillard, a principal at BASF Venture Capital America Inc.

History shows what happens when man doesn't play well with nature. Read about three civilizations that fell when their local ecosystems could no longer sustain them.

The company is flying relatively quiet today. But there are indications that IBM—yes, IBM—could emerge as a solar powerhouse, according to columnist Neal Dikeman, who's done some poking around.