Earth's atmosphere contains the perfect balance of ingredients for life to breathe and exist: 78% nitrogen, 21% oxygen, 1% other. See how we use spacecraft, airborne missions & research on the ground to understand & protect the air we breathe: https://t.co/dlHmzKoLtk #EarthDay
"Something to think about:
The Earth is 4.6 billion years old. Let's scale that to 46 years. We have been here for 4 hours. Our industrial revolution began 1 minute ago. In that time, we have destroyed 50% of the world's forests. This isn't sustainable." #EarthDay