To Fly or Drive
To fly or to drive: which leaves the smallest carbon footprint? That question is dealt with rather nicely in this article, Climate Change and Air Travel, from Tufts University.
Here are some simple, but effective suggestions they have:
If you can avoid traveling for business by using video and phone conferencing, do it!If you have the option of taking the train instead of the plane or car, take the train!
If you can choose between local vacations and vacations somewhere far away in the tropics, stay local!