Delta Air Lines announced it plans to spend $1 billion over 10 years to mitigate its carbon emissions globally, part of its goal to eventually become carbon neutral.
But it stopped short of saying how much it would reduce emissions this decade, or when it hopes to become neutral.
Atlanta-based Delta said the investments will include more fuel-efficient planes, efforts to reduce weight on planes and investing in development and use of sustainable aviation fuels.
It will also involve putting money towards projects to remove carbon emissions from the atmosphere through wetland and grassland conservation and other efforts, and invest in a fund focused on carbon neutrality.
The move follows JetBlue's announcement last month that by July 2020 it will offset carbon dioxide emissions for all of the jet fuel for its domestic flights. Delta's announcement is broader, covering its flight network around the world, but will take longer and cost more.