Calculate carbon offsets for your car, plane or train trip with the free United Nations Environment Programme Carbon Calculator iPhone app.

BBC: How big is your carbon footprint?

You can see it every time you step off a plane or a train and meander to a busy taxi rank.

BBC: Communal cabbing

They accomplish this by synching the the news sources you follow, so that the content is on your mobile device when you are off the grid, perhaps on a plane or a train.

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But take any plane, train or bus and consumers are holding--paper.

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Whether you travel by plane, train or automobile, Bon Voyage by Jetsetter will make you want to get up and go somewhere, or at least dream about reaching your next destination.

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Immediately after a bone marrow harvest, a volunteer courier travels -- by plane, train, or automobile -- with the stem cells and personally delivers them directly to the patient's location.

CNN: Why I donated my bone marrow

Short of shelling out for plane tickets or enduring long train rides, there is another way to keep in touch with friends and family, no matter where they are...you can give the gift of Skype.

ENGADGET: Skype launches gift cards, lets parents drop hints to distant kids

In the meantime, you might as well book a reservation on both a plane and a train if you really need to get to New York, or anywhere else.

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