And at the same time to scrap inefficient old planes, so that if they were otherwise to come back in the air, they would waste more oil, and block the uptake of efficient, new planes.
e de abater aviões velhos  pouco eficientes, que, se voltassem novamente ao voar, desperdiçariam mais petróleo e iriam bloquear a compra de aviões novos e eficientes.