Ticklish Ideas

A climatologist in Wisconsin has been studying the effects of jet trails on surface temperature. The jet exhaust isn't especially contributing to greenhouse gas buildup, but it is creating clouds where there wouldn't normally be any - above the troposphere, where clouds seldom form. The last thing we need is a new fluffy blanket to hold more heat close to the planet. Harumph.

I'm dreaming of having a decent train service in the inland US, if the hidden costs of air travel come out.