Most Europeans have heard of "flight shaming," and now the EU hopes green jet fuel will be the answer to aviation emissions. The bloc has set ambitious production targets, but not everyone is sold.
Climate activism has intensified in the past few years as the planet warms to dangerous levels, igniting more extreme heat, floods, storms and wildfires around the world.
Sustainable aviation fuels aren’t enough to drastically cut commercial aviation’s carbon footprint soon. Nor are redesigned planes or carbon-smart airports. Reducing demand for air travel may be the best answer.
Kelp is fast and relatively easy to grow, and already a vital food in many parts of the world. Martha Henriques asks whether it could also power the aircraft of the future.
