United will fly planes fueled by farm waste, animal fat this summer

This summer, starting on its Los Angeles to San Francisco route, United Airlines will fly commercial jets using a biofuel made out of plant oil and animal fat. In 2013, United agreed to buy 15 million gallons of the fuel, produced in California by AltAir Fuels, over three years, with the option to buy more. AltAir uses discarded farm waste like tallow (rendered animal fat) plus non-edible natural oils to make biofuel that works in existing jet engines.
The AltAir fuel will be blended with traditional jet fuel, starting with a 30/70 mix. But United isn't placing all its bets on AltAir. On Tuesday, The New York Times says, United will announce a $30 million investment in Fulcrum BioEnergy — a small amount compared with the $11.6 billion United spent on fuel last year, but the largest such investment by a U.S. carrier to date. Fulcrum turns municipal garbage into aviation fuel, promising cheap green fuel from a plentiful source of raw material.
Airlines are trying to reduce their carbon emissions but alternative, sustainable sources of jet fuel aren't yet available in dependable quantities. The industry hopes to cut its greenhouse gas emissions to half their 2005 levels by 2050.
Subscribe to The Week
Escape your echo chamber. Get the facts behind the news, plus analysis from multiple perspectives.

Sign up for The Week's Free Newsletters
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
Sign up for Today's Best Articles in your inbox
A free daily email with the biggest news stories of the day – and the best features from TheWeek.com
Peter has worked as a news and culture writer and editor at The Week since the site's launch in 2008. He covers politics, world affairs, religion and cultural currents. His journalism career began as a copy editor at a financial newswire and has included editorial positions at The New York Times Magazine, Facts on File, and Oregon State University.
-
Amazon's 'James Bond' deal could mean a new future for 007
In the Spotlight The franchise was previously owned by the Broccoli family
By Justin Klawans, The Week US Published
-
Why are Republicans suddenly panicking about DOGE?
TODAY'S BIG QUESTION As Trump and Musk take a chainsaw to the federal government, a growing number of Republicans worry that the massive cuts are hitting a little too close to home
By Rafi Schwartz, The Week US Published
-
What is JD Vance's Net Worth?
In Depth The vice president is rich, but not nearly as wealthy as his boss and many of his boss' appointees
By David Faris Published
-
Trump's China tariffs start after Canada, Mexico pauses
Speed Read The president paused his tariffs on America's closest neighbors after speaking to their leaders, but his import tax on Chinese goods has taken effect
By Peter Weber, The Week US Published
-
Chinese AI chatbot's rise slams US tech stocks
Speed Read The sudden popularity of a new AI chatbot from Chinese startup DeepSeek has sent U.S. tech stocks tumbling
By Peter Weber, The Week US Published
-
US port strike averted with tentative labor deal
Speed Read The strike could have shut down major ports from Texas to Maine
By Peter Weber, The Week US Published
-
Biden expected to block Japanese bid for US Steel
Speed Read The president is blocking the $14 billion acquisition of U.S. Steel by Japan's Nippon Steel, citing national security concerns
By Peter Weber, The Week US Published
-
Judges block $25B Kroger-Albertsons merger
Speed Read The proposed merger between the supermarket giants was stalled when judges overseeing two separate cases blocked the deal
By Peter Weber, The Week US Published
-
Rupert Murdoch loses 'Succession' court battle
Speed Read Murdoch wanted to give full control of his empire to son Lachlan, ensuring Fox News' right-wing editorial slant
By Peter Weber, The Week US Published
-
Bitcoin surges above $100k in post-election rally
Speed Read Investors are betting that the incoming Trump administration will embrace crypto
By Peter Weber, The Week US Published
-
Enron mystery: 'sick joke' or serious revival?
Speed Read 23 years after its bankruptcy filing, the Texas energy firm has announced its resurrection
By Peter Weber, The Week US Published