-using this resource

Global warming

  -the facts

  -case study

  -hot map

  -CO calculator

  -pledge guest book


  -lesson activities

  -data analysis

  -data logging



  -links page




What's known for certain?

We know:

  • that gases like carbon dioxide and methane are greenhouse gases

  •  that we are increasing the amount of these gases into the atmosphere

  • that much of this is due to burning fossil fuels

  • that the CO2 in the atmosphere has increased


This graph shows changes in the concentration (parts per million) of carbon dioxide in the atmosphere over time. Carbon dioxide has built up rapidly in the atmosphere since the beginning of the Industrial Revolution. Levels are now more than 40 percent higher than they were in 1700. 

What are the early warning signs ?



We know:

  • that the Earth has warmed up

  • there has been a warming of 0.50C ( 10F) in the last 100 years

Warning signs include:

  • heat waves

  • sea level rising

  • glaciers melting

  • coastal flooding

  • Arctic and Antarctic warming

What are we uncertain about ?


We do not know: