The carbon footprint increases due to the rather disposable nature of the blanket and the fact that it is most likely not used only on the plane. Besides that, whether the carbon footprint increases i.e. the actual output depends on the load on the alternator. Like a car driving with the AC on uses slightly more gas. Naturally, the blanket will put a minimal marginal load on the alternator of an aircraft. However, in principle, it is a device that uses electricity versus a device that conserves energy.
Ummm...ok. Carbon footprints are a scam. All about redistributing wealth. But now we are venturing into OMNI grounds.
I always carry a small nalgene water bottle (empty through security), usually to fill from the fountains. But I've had no problems getting it filled at airside coffee/tea shops with hot/boiling water when I know it'll be a cold flight, especially if I'm getting something else there anyway. Great for keeping hands/feet warm for a couple of hours. Combine with a lightweight fleece throw and you're golden . If you're really lucky the FA's might even give you a refill mid-flight.
. If you're really lucky the FA's might even give you a refill mid-flight.
