They're looking to reduce plastic bags in parks -- not eliminate: "Plans also call for Disney to reduce the number of plastic shopping bags in owned and operated parks and on Disney cruise line, offering guests the option to purchase reusable bags at a nominal price."
I have no intention of carrying around reusable bags on my vacation. It's not practical particularly with resort pickup and the like.
And I'll just mention this... perspective is important when we evaluate the actual anticipated impact of any of these moves (US is at 1.3% of the total):
https://www.statista.com/chart/12211/the-countries-polluting-the-oceans-the-most/
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That's MISMANAGED plastic waste, which is very different than "plastic" waste. We bury a lot of ours and call it "managed." Or, we "recycle" it and ship it to China and call it "managed." It's not. It lasts nearly forever. We should all work to drastically reduce our "single" use plastic containers. The US produces .33 kg per day per person of plastic waste. China produces about 1/3 as much, .12 kg per day per person. Now, they have a LOT more people, so the total per day per by country is equal to or exceeds ours, but we still produce more per day per person. We can do better.
I long ago gave up plastic bottles of water. So, so wasteful.