Shea's Note: I'm moving to the big city of Portland, Maine, this week and taking a few days off from writing to pack and move. Some of my green blogger pals are helping me out by writing a few guest posts. Today's post comes courtesy of Matt Embrey. You can read his post and find links to his work at the bottom.

Finally, NASA has answered my emails and given us a time machine. They missed the mark a bit, and unfortunately this time machine doesn't allow you to go back and buy stock in or stop yourself from getting that NKOTB tatoo, but it does let you travel back so you see the effects of climate change on the Earth. A joint project between NASA's Jet Propulsion Lab and the California Institute of Technology, the "Climate Time Machine" is a web app that allows you to visualize recent changes on earth in dramatic detail.

The site has four visualization modes:

Sea Ice: "This visualization shows the annual Arctic sea ice minimum from 1979 to 2007. At the end of each summer, the sea ice cover reaches its minimum extent, leaving what is called the perennial ice cover. The area of the perennial ice has been steadily decreasing since the satellite record began in 1979."

Sea Level: "Recent satellite observations have detected a thinning of parts of the Greenland ice sheet at lower elevations. A partial melting of this ice sheet would cause a 1-meter (3-foot) rise. If melted completely, the Greenland ice sheet contains enough water to raise sea level by 5-7 meters (16-23 feet). This visualization shows the effect on coastal regions for each meter of sea level rise, up to 6 meters (19.7 feet)."

CO2 Emissions: "This visualization shows the amount of annual carbon dioxide emissions produced by the top 12 nations or regions from 1980-2004. Units are given in thousand metric tons of carbon dioxide emitted from fossil fuel consumption."

Average Global Temperature: "This color-coded map shows a progression of changing global surface temperatures from 1885 to 2007. Dark blue indicates areas cooler than average. Dark red indicates areas warmer than average."

While this time machine won't allow us to change the past, it's a powerful tool that can educate people -- hopefully helping us change the future.

Visit the Climate Time Machine

via NASA's Climate Change website
