Tim de Chant has created a great infographic that shows the ecological footprint that would be used if the whole world's population (estimated at 7 billion) lived like the inhabitants of various countries. Obviously, Bangladesh and the U.S. have very different ecological footprint - something that we can very easily guess - but seeing the difference visually does give a more intuitive grasp of how big that difference is. Of course, you rapidly run out of space once you get to the richest countries and start needing more than 1 Earth, which is something we don't have.
You can visit Tim's website here: Per Square Mile
Thanks to Tim for giving us permission to reproduce his infographic!