Fossil fuels are materials that are non-renewable such as oil, gas and coal. Aside from causing local air pollution from polluting particulates, the burning of fossil fuels releases carbon dioxide into the atmosphere, which is a greenhouse gas that contributes to climate change. Moreover, many fossil fuels are reaching their "peak" (oil being the most rapidly depleted). At some stage in the near future, switching from fossil fuel usage to renewable energy makes sense from economic, environmental, safety and health points of view. By starting your journey in conserving fossil fuels through changing your own uses, you can help others to see that a good and healthy life can still be had without guzzling away these precious resources.Have really good reasons for flying. Just because a fare is really low does not mean you need to buy it. Were you really planning to travel to that place or is this a total whim? Have a set of reasons that guide your flying choices, such as family reunion = important; cheap flight to party island = not important, etc. Follow news items about the ways in which the airline industry is being creative about harnessing new fuels and being more fuel efficient. Share this news with friends, and send messages of support to airlines that are trying to reduce their fossil fuel usage. They need to know the average traveler is watching and caring.