Big Sky Country is under siege from the carbon spewed by the planes and cars we use to get there, says Montanan Deirdre McNamer. She remembers the days (the 1950s) when it was not politically incorrect to throw litter into the vastness of the high prairie that she thought could never be affected by the humans it dwarfed.
Now the wildlife and scenery that attracts visitors to Montana is being endangered by modern forms of travel. Her solution? Take the train.