Now boarding: Net-zero aviation
Whether you enjoy air travel or not, it’s increasingly common and persistently bad for the environment. Almost three million passengers fly in and out of US airports each day and global demand for air travel is expected to double by 2050. In addition to emitting pollutants that lower air quality, aviation is recognized as a hard-to-decarbonize sector and accounts for ~3% of global CO2 emissions. Airlines have recently announced commitments to switch to "green" fuels, but as of today 95% of jet fuel is produced from fossil fuels. Why is that?