The environmental impacts are not the same. If you find a study not funded by Pampers or Huggies you will understand that. The majority of cloth diaper users only do one extra wash every three days. Probably the same or less than a family using disposables does to deal with blow outs. Most diapers are air dried so there is no energy consumption in terms of driers. Disposable diapers use MUCH more water. First there is the tremendous amount of water used in the production of the diapers and the bleaching of the fibers. Then, of course, as it is illegal to place fecal matter into a landfill, there is the water used to flush any solid water away before disposing of the diaper. Finally, cloth diapers do not contain all the horrible nasty chemicals that disposables do. Disposables are not super absorbant due to sweet little fairies waving their wands. They are absorbent due to all sorts of nasty chemicals (including some that are banned for use in adults) that we are putting right next to a child's skin where they can be absorbed. Ever see little blue crystals next to your child's skin if you waited too long to change the diaper? Yikes. I shudder to think of all the health (and reproductive health) issues we may see in the next 20-30 years due to the use of these diapers. Finally, a cloth diapered kid potty trains significantly earlier than a disposable diapered child which even further lessens the environmental impact.
Have a great trip!
Where ever did you get the idea that people flush the "poop" from a disposable diaper?
The only people that do that are cloth users. I also would like to see you source of "most people air dry" because I am the only person I know who even has a clothes line and some communities don't even allow them.

I was trying to keep it from being a debate, but I guess that's impossible on the DIS. 