m33.    How does global warming affect climate?

Measured levels of CO₂, nitrous oxide, methane, and CFCs have risen in the last decade.  Human activity, burning, deforestation, and so on, have increased these levels (AIRNOW).

The countries that emit all these gases are: US (18.4%), Russia et al. (13.5%), China (9.1%), Japan (4.7%), India (4.1%), Brazil (3.9%), and Germany (3.4%). Since 1970, the oceans have absorbed more than ¹/₃ of excess CO₂.  Some scientists believe that virgin forests have absorbed at least this much.  Those portions of the forests, which have been disturbed, absorb less excess CO₂. Deforestation may account for a rise in excess CO₂ of 20-33%.

e04.    What sorts of resources do rangelands produce?

e10.    Why do organisms become extinct?

e12.    Where are tropical forests?

e15.    What was early life like?

e16.    What do computer models of greenhouse changes show?  

e22.    What do we eat?

g04.    What causes climates to change?

g08.    What are the spheres that make up the earth?

g13.    What makes up earth's climate?