Mauna Loa CO2 concentrations < http://www.grida.no/climate/vital/06.htm>
Thinning of Artic sea-ice < http://www.grida.no/climate/vital/30.htm>
Vostok Ice Core CO2 and temperature data <http://www.grida.no/climate/vital/02.htm>
Ice Break-Up Datas for River Tornio <http://www.grida.no/climate/vital/31.htm>