Business Green: Despite global recession and plummeting levels of investment in the wider economy, venture capital firms pumped nearly $5bn (£3bn) into clean tech businesses last year, according to new figures from analyst Greentech Media. The company reported that global venture capital investment in clean tech firms reached $4.85bn during 2009. The performance marked a fall of 36 per cent on the $7.6bn invested in 2008, but it still represented the second-best year on record for the sector, …