Why shipping is seen as the bad boy i really do not understand.
Globally, emissions from shipping is responsible for 3% of "climate gas" emissions. Not bad considering ships transport approx 80% of all goods in the world.
For emission reduction, shipping started this in work in the 70s, die to increasing fuel cost.
For a suezmax tanker the fuel consumption is halved n less then 20years.
For other trades the reduction is even bigger.