Ryanair said it is aiming to achieve a third of its decarbonisation target by flying its planes with sustainable aviation fuels, and will also rely on offsetting measures to cut its emissions to net zero by 2050.
Ryanair is Europe's largest airline by passenger numbers.
It committed last year to power 12.5% of its flights with sustainable aviation fuels by 2030, although group chief executive Michael O'Leary has since said he is not sure Ryanair will reach the "very ambitious target."
Sustainable jet fuel generally produces up to 70% less carbon than fossil fuels, offering airlines a way to become greener while continuing to fly.
This comes before less carbon-intensive hybrid, electric or hydrogen aeroplane options become available from the late 2030s.
Ryanair said today that its order of 210 Boeing 737 MAX jets, which use around 16% less fuel than the current generation of 737s while squeezing in 4% more passengers, will help it meet 32% of its decarbonisation target.
Critics say the low-cost business model encourages people to fly more frequently and drives growth in the total number of people flying.
Ryanair plans to grow from flying around 150 million passengers a year before the Covid-19 pandemic to 225 million by 2026, although it predicts that total short-haul capacity in Europe is likely to be lower after the pandemic.
Offsetting measures, which Ryanair said will include carbon capture offset projects and supporting government policies and reforms, will contribute a further 24%.
One such reform, an overhaul of the European Union's air traffic management agreed by member states last year, will take care of the final 10% of Ryanair's decarbonisation target, the airline estimated.
Ryanair's Director of Sustainability, Thomas Fowler, said the airline understands that aviation plays a pivotal role in tackling climate change, adding that its pathway to net zero will help it do just that.
"We are working tirelessly with our team and strategic partners to lead the way in making aviation more sustainable", Mr Fowler said.
"We were delighted to be upgraded to a "B" rating by the Carbon Disclosure Project this year, recognising our commitment to reducing our environmental impact. While we've already come a long way, we will continue to lead the sustainable aviation agenda in European aviation as we embark on our ambitious Pathway to Net Zero by 2050," he added.
