There is no actual definition of what a 'green collar' job is, but this makes it easier for politicians to inflate the numbers they promise to create. It appears that any job remotely linked to a more environmentally friendly outcome would be counted.
So, a worker on an assembly line in a Prius factory would count. The kid taking the trash out at McDonalds would count.
The myth of a 'green collar job' is that new jobs are being created. If environmental regulations force power companies to go to natural gas for solar power, then the people who manufacture and install the panels will have 'new' jobs. But, those who mined and distributed the natural gas, will be out of work. Wouldn't that be a blue collar job transfer to a green collar job?