Green products (recycling, solar power, hybrid cars, etc.) are more about consumption than production, since people are willing to pay/subsidize them to "feel good."
In the same way, green jobs (carbon adviser, sustainability director, etc.) are less productive than "brown jobs" because they must be subsidized before people will speak to workers...
In these senses, both are oxymorons: they are called "productive" but they are actually consumptive.