Assertion: air travel | /r/HasProperty | one of the hardest
Facets:
value: technologically
type: OTHER
Source sentences:
text: When people rank the difficulty of finding structural solutions to greenhouse gas emissions in various sectors, air travel is one of the hardest both technologically and practically, and there aren’t serious policy proposals yet that would solve the issue through limiting air travel or changing the energy sources for commercial aircraft on a significant scale," Hecht said.