The venture capital industry is under pressure. The number of firms is on the decline.

However, one growth industry is clean technology.

Craton Equity Partners is nearing the halfway mark for raising its venture capital fund, to be focused on clean technology companies, according to VentureWire (subscription required). The Los Angeles-based firm is targeting $250 million, and has raised more than $40 million since holding an $82 million first close last year.