The good news: A report from the International Council of Clean Transportation (ICCT) finds that it’s technically possible to reduce flight-related carbon dioxide (CO2) emissions to nearly zero by 2050. The bad news? Technology won’t save us if the number of flights keeps skyrocketing. Trains, too, are part of the solution. Vision 2050 posits that after 2030, about 20 percent of passengers on short flights (466 miles or less) between cities will opt for high-speed rail instead. Read more about ICCT’s most ambitious scenario—called “Breakthrough” from @SierraMagazine: https://sc.org/3B8p6pP Photo by iStock/Petmal