HOUSTON (Reuters) - Commander Eileen Collins said astronauts on shuttle Discovery had seen widespread environmental destruction on Earth and warned on Thursday that greater care was needed to protect natural resources. Her comments came as NASA pondered whether to send astronauts out on an extra spacewalk to repair additional heat-protection damage on the first shuttle mission since the 2003 Columbia disaster. Discovery is linked with the International Space Station and orbiting 220 miles above the Earth. "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...