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That is very bad. I dare say it won't affect most of us in our lifetimes, but it is still very bad.
My opinion is that their logic is flawed. They are saying that air-travel will increase due to cheap air-fares and therefore we will have much more contrails in the atmosphere. I do not think they have taken into account the growing trend for people to work from home and not commute to work. I believe people are destined to be house potatoes ordering everything they require over the internet so they don't leave the house. Bleak I know, but look at America, they are already heading down that track. If the rest of the world does the same, we will not have so much pollution from planes/cars/buses. So perhaps Astronomy will survive for those couch potatoes who are able to peel themselves out of their chairs and go outside (or look through their skylights).
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