We would like to see, from the astronauts' point of view, people
take good care of the Earth and replace the resources that have
been used. Sometimes you can see how there is erosion, and you can
see how there is deforestation. It's very widespread in some parts
of the world. The atmosphere almost looks like an eggshell on an
egg, it's so very thin. We know that we don't have much air, we
need to protect what we have.
==Commander Eileen Collins onboard the space shuttle Discovery