This morning, EPA Administrator Wheeler announced proposed US standards for new aircraft CO2 and fuel efficiency. The standards, which have been under development for more than a decade, are an important milestone. THREAD https://www.epa.gov/regulations-emissions-vehicles-and-engines/notice-proposed-rulemaking-control-air-pollution

Unfortunately, upcoming @TheICCT research concludes that the proposal is too weak to accelerate investments in more fuel-efficient aircraft. Sharing some insights here from that work, which will be published next month and updates this 2015 paper. (2/x) https://theicct.org/sites/default/files/publications/ICCT_Aircraft-FE-Trends_20150902.pdf

New aircraft deliveries in 2019 were already 6% more fuel-efficient than required in 2028. The average new commercial jet delivered in 2016, the year that the @icao standard the EPA is codifying was finalized, already met the 2028 requirements. (3/x)

That means that the proposed standard lags state-of-the-art technology by more than a decade. New aircraft types that entered into service in recent years are even better. Advanced new type aircraft pass the standard by 10 to 20% on average. (4/x)