Walking: While it will take a long time to get where you want to go, walking is by far the most friendly way to travel the world. Burning only the food you eat, you won’t be responsible for large amounts of emissions, and this is a great way to ensure that you’re not causing harm in an effort to see more of the planet. All you need is a sturdy backpack, a good pair of shoes, and some money to take with you, giving you everything you need to see a huge portion of the globe, even if you don’t move very fast.
Sailing: A lot of people ignore sailing when they are thinking about environmentally friendly travel. Unlike using a powered boat, having sails gives you the chance to rely on the wind to move you around, and this won’t produce any emissions whatsoever. You can borrow boats fairly inexpensively, though you will need to take some lessons if you want to pilot it yourself. This sort of effort will be well worth it once you get to see the world from the surface of the sea.
Driving: Modern cars aren’t anywhere near as bad for the environment as they used to be. Nowadays, it doesn’t take much to fuel these vehicles, especially if you choose something which is built to be good for the Earth. You might need some tools, like a car brake bleeder and a spare tyre, just to make sure that you don’t find yourself stuck anywhere. But, with these items in the trunk, you should be able to set off around the world for a long time without getting uncomfortable or bored.
Public Transport: Finally, as the last option on this list, public transport is very good in a lot of cities around the world. Trains can move you very quickly without using much fuel, and buses can also be good for the world. The only option to avoid is planes. These machines are true gas guzzlers, while also making life hard for the other occupants of the sky, like birds. You can find out about worldwide public transport with a couple of searches around the web.