Owen Paterson gets the credit for setting this phrase into popular use (as far as I can tell). Here is his definition:
Owen Paterson: I’m proud of standing up to the green lobbyBy this I mean the mutually supportive network of environmental pressure groups, renewable energy companies and some public officials who keep each other well supplied with lavish funds, scare stories and green tape. This tangled triangle of unelected busybodies claims to have the interests of the planet and the countryside at heart, but it is increasingly clear that it is focusing on the wrong issues and doing real harm while profiting handsomely.
Local conservationists on the ground do wonderful work to protect and improve wild landscapes, as do farmers, rural businesses and ordinary people. They are a world away from the highly paid globe-trotters of the Green Blob who besieged me with their self-serving demands, many of which would have harmed the natural environment.
Pressed in Fenbeagle’s hand the Green Blob became The Green B-Lobby. Which adds that edge — the amorphous blob becomes a Lobby blob.
…