Many of the people objecting to my challenge say it should be about why we need to worry about global warming, or even about what to do. They clearly have not paid attention to what the challenge is all about.
But, they are correct in one thing, we need to discuss the effects of global warming more. Is global warming good for us? Bad for us? Or, does it even make a difference? I will be spending more time addressing this issue in the future once I am done with the challenge (come on July 31st!).
In that vein, here is a NASA news release about a study of water in the Colorado River Basin. It paints a pretty bleak picture about what is going on with water in the Southwestern U.S. Using data from the GRACE satellite, scientist have been able to identify the amount of mass the basin area has lost since 2004 and determined it has lost about 53 million acre-feet of water. That is almost twice the total volume of Lake Mead, the largest reservoir in the U.S. What is really scary is that 41 million acre-feet of that amount came from ground water. Imagine you lost 75% of your income and you then started depleting your savings to maintain the same standard of living. Eventually, your savings are going to run out and you will be faced with a bad situation. That is where the Southwest is today in regards to water. The area has lost its water supply and has been relying on ground water to keep things going the same way instead of changing the way they do business. But, as they say in the new release, we don’t know how much ground water there is, so we have no idea how long it will last. If it starts to run out, then there will be a very bad situation in the Southwest.
So, what does this have to do with global warming? Well, there is growing evidence the on-going drought is the result of global warming, and there is growing evidence that the effects of droughts are made worse by global warming. Basically, rainy areas will see more rain while dry areas will see less. Additionally, precipitation that falls as snow on the mountains melts slowly over time and provides water into the summer. As the temperature goes up, it gets too warm for snow and the precipitation falls as rain, which runs off and is no longer available when the dry months of summer come along. To make it worse, the higher temperatures mean there is more evaporation and the area loses even more water. None of these scenarios are good for the future of anyone depending on the water of the Colorado River Basin.
Read this article on the effects of global warming on the area. Richard Seager, a climate scientist who studies water issues at the Lamont-Doherty Earth Observatory of Columbia University in New York does not believe the drought is caused by global warming, but he goes on to point out that the Southwest has suffered drought conditions in some form for 15 years, and warmer climates have resulted in winter precipitation tending to fall as rain rather than snow. With less snow melting during the spring there is a lack of water during the hot summer months.
“It all adds up across the Southwest to an increasingly stressed water system,” he said. “That’s what they might as well get ready for.”