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Sheeraz Haji, chief executive of the Cleantech Group, which tracks global investment in the sector, says the working title for his fourth quarter 2011 presentation was "Cleantech did not implode".

M&A up, IPOs down in 'surprising' year for cleantech

Sheeraz Haji, chief executive of the Cleantech Group, which tracks global investment in the sector, says the working title for his fourth quarter 2011 presentation was "Cleantech did not implode".

Sheeraz Haji, chief executive of the Cleantech Group, which tracks global investment in the sector, says the working title for his fourth quarter 2011 presentation was "Cleantech did not implode".