I hope no one buys for one second that Disney and its executives actually care about the environment. Much like the air conditioning reduction some years ago, this is just something they're doing to pinch pennies at the expense of guest comfort and enjoyment. The environment thing is simply an excuse to shut down some of the more gullible tree huggers when people question this decision.
And I say this as someone who is also a tree hugger and environmentally conscious whenever possible. I don't eat meat (this actually started over 15 years ago as a health and welfare based decision, but the environmental impact is welcome too). Our lights are all LED, I turn off energy hogging appliances when i don't need them (like the water heater), have a hybrid car etc. And I accept the overwhelming scientific consensus that climate change is caused by people and is an existential threat to life on this planet.
Disney doesn't actually care. Hence their execs still having their enormous terrible for the environment mansions (multiple ones in some of their cases), golf courses and private jets that are 10x more polluting per passenger than commercial.