Achieving shipping’s 2050 net zero-emission goals will require all of the world’s current renewable energy production to create the green fuels needed for the global fleet, a report highlights.

“Shipping’s fuel needs would require electricity from renewable sources to increase by up to 3,000 terawatt hours [TWh],” the report commissioned by the International Chamber of Shipping (ICS) said.

That is equivalent to today’s global clean generation capacity, which means the world would need an 18-fold increase in existing renewable production, according to the International Energy Agency’s net-zero-emissions scenario for 2050.