Re: Let's get real
It wasn't the 'green' box the airlines (and Boeing) wanted to tick, it was the 'fuel efficiency' box. Fuel costs money. Planes consuming more fuel per passenger-mile than their competitors tend to cause strong incentives to get replacements that instead consume less than their competitors. Aircraft manufacturers prefer these replacement to be theirs, and airlines prefer to fly a fleet that's as homogeneous as feasible, given their routes, as it reduces crew training. Hence an existing model upgraded tends to be preferred over a spiffy new model.
And it's not 'climate change'. 'Climate catastrofe' is where it's going.