How on earth would a hotel chain know how many point it took to offset the CO2 emissions of my stay? The amount of offset depends greatly on the amount of energy I'm not using at my permanent home during the hotel stay. That will range from very little to some - for example, when I'm on a business trip and three other people are at home - to a net decrease in emissions for others - for example, someone who lives alone in a space larger than the hotel room. (Maybe the "offset" for that person should be bonus points. )

Maybe an airline will set up a way to donate to a "green" charity, but I don't see this as a big trend. Currently, in the U.S., there is no good mechanism to donate FF miles. I'm not complaining about that: I'd rather keep the IRS as distant from the mileage business as possible and just donate cash and/or my time to the charities of my choice, using the miles for free travel.