Richard Black, Environmental Correspondent for BBC news reports that:-
'Ships could be charged different fees to dock depending on how much carbon they emit, according to ideas being discussed at the UN climate summit.
The government of Papua New Guinea is considering the plan, and is hoping other nations may become involved.
The Carbon War Room, co-founded by Sir Richard Branson, has launched an online tool grading 60,000 commercial vessels according to their emissions.
Shipping contributes about 1Gt of CO2 each year, more than the entire UK.'
Here is the link to the Carwww.carbonwarroom.com/bon War Room