Shipping is facing the most drastic requirement for change to vessel propulsion since engines were first put onboard sailing ships more than 100 years ago.

At the time the Paris Agreement on climate change of 2015 was signed, it was thought reducing manmade emissions by about 75% would maintain a maximum increase in temperature of 1.5C to 2C.

Now, scientists say that not only do we have to cut emissions by 100%, we would also have to recover and store previously emitted greenhouse gases (GHGs) to keep global temperatures under control.