how many trees does it take to gobble up 15,000 miles of carbon?

In just 12 days I will be boarding a jet at JFK International Airport, bound for India.  As we lift off from New York, there will be a lot of things on my mind about the trip---what will we see? what will we eat? when do we get to meet Aishwarya Rai?  Finding out the answers to these questions is going to be an amazing adventure.  But there is one question I have already figured out: what is the "carbon footprint" of sending 27 Colgate faculty to the other side of the world, and back?