Assertion: airbus's aircraft | /r/HasProperty | replaced by electric or hybrid aircraft
Facets:
value: due to regulatory constraints
type: CAUSE
Source sentences:
text: Berger predicts a 24% CO2 share for aviation by 2050 if fuel efficiency improves by 1% per year and if there are no electric or hybrid aircraft, dropping to 3–6% if 10-year-old aircraft are replaced by electric or hybrid aircraft due to regulatory constraints, starting in 2030, to reach 70% of the 2050 fleet.