“For the first time in my life I saw the horizon as a curved line. It was accentuated by a thin seam of dark blue light – our atmosphere. Obviously, this was not the ocean of air I had been told it was so many times in my life. I was terrified by its fragile appearance.”
– Astronaut Ulf Merbold, Federal Republic of Germany

Hey, I’ve got an idea. Let’s run a long-term experiment where we irrevocably change the composition of the Earth’s atmosphere. We could pump huge amounts of carbon dioxide up there to see what happens! What could possibly go wrong?

(photo by retired NASA astronaut Leland Melvin – http://www.lelandmelvin.com/ )

February 1, 2017