LINKS

 

  CLIMATE & US

http://climate.nasa.gov/




http://www.giss.nasa.gov/

http://earthobservatory.nasa.gov

SNOWBALL EARTH
http://www.bbc.co.uk/nature/ancient_earth/Snowball_Earth
https://www.youtube.com/watch?v=Dv0e-zGGgjQ
http://globalwarmingsimplified.weebly.com/

http://www.noaa.gov/
http://www.ncdc.noaa.gov/