Jim Frederickson, the research director at the Composting Association has called for data on worms and composting to be re-examined after a German study found that worms produce greenhouse gases 290 times more potent than carbon dioxide.
Worms are being used commercially to compost organic material and is in preference to putting it into the landfill. The German government wants 45% of all waste to be composted by 2015.
"Everybody... thinks they can do no harm but they contribute to global warming. People are looking into alternative waste treatments but we have to make sure that we are not jumping from the frying pan into the fire," said Frederickson.