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From lithium ion and compressed air to gravel ski lifts, electricity storage investment heats up.

Beneath the gloomy numbers, are some VC’s feeling…optimistic?

Innovation in the water sector is spawning new early-stage companies, which are attracting capital from venture and strategic investors.

Mohr Davidow’s Josh Green and VantagePoint's Alan Salzman discuss the latest bets they are making in cleantech.

Opportunities abound for venture firms willing to invest in companies that use technology to solve the conventional energy industry's sustainability problems.

Two financing vehicles on the cusp of untangling new, lower-cost capital for clean technology projects got a huge helping of publicity during recent clean technology conferences.

Despite current challenges, the industry guru breaks down the key industry trends that will cause clean energy investment to triple by 2030.

Cleantech VCs rate their top investment choices from the Cleantech Forum's entrepreneur competition.

Although China emerged as the leader in 2012, South Africa’s clean energy investment grew the fastest, followed by Mexico and Turkey.

A report by the International Energy Agency says emissions have not even been cut 1% since 1990.