美国能源部：2024年可持续航空燃料的商业腾飞之路报告（英文版）

In the United States, aviation currently represents roughly 3% of total greenhouse gas emissions, and fossil jet fuel consumption is forecasted to increase by 2-3% annually through 2050.1 Although aircraft built in the last 15 years are up to 20% more fuel efficient than their predecessors,2 the fuel that powers them remains carbon-intensive. Furthermore, hydrogen and electric planes may provide low-emission or zero-emission options for smaller planes and shorter flights, but these technologi