| Published: April 22, 2010 – 8:07 am
Today, we celebrate our remarkable home planet. It has just the right balance of heat and light to create seasons, and more importantly, to have water as a solid, a gas, and especially as a liquid. Water is what makes the chemistry of living things possible. It really is amazing. The Earth is just the right distance from the Sun and is just the right size to allow animals like us to wonder all over the place. Perhaps even more remarkable: we have the ability to think about all this. We can think about our place in outer space. As my old professor Carl Sagan observed, humans are one of the Universe’s way of knowing itself. Today, we should remind ourselves that none of these thoughts would be possible without the Earth itself.
When Earth Day started out, back in 1970 before even disco music came to be, it was all about pollution. Humans were trashing the planet, especially our water and air. We have made a little progress, in some parts of the world our water is a little cleaner, and there is less smog in the air. In other places though, human trash is bad as ever and getting worse. More important than all the trash is Climate Change, an even more important reason to be mindful of Earth Day. There are so many people living on what is turning out to be a pretty small planet, that we’re changing our climate faster than ever in history. This will cause trouble for billions of us if we don’t get busy. So let’s work together and make the world cleaner and cooler. Using science and the shared knowledge that we all live on our favorite planet, we can change the world. Happy Earth Day.