It is one of a number of business ideas that have grown out of the global demand for carbon trading schemes, and it's becoming a big business. (loe.org)
A carbon tax would be simpler, more effective, and could be implemented much more quickly, than the proposed carbon trading scheme. (ramblingsdc.net)
That led to a surplus of permits in carbon trading schemes, pushing prices down and letting many polluters off the hook. (carbonbrief.org)