Earth Cycles

The Carbon Cycle: What Goes Around Comes Around

by John Arthur Harrison, Ph.D.

Further Exploration

How much will Earth warm if carbon dioxide doubles pre-industrial levels?

NOAA / - Discussion of what effects doubling pre-industrial carbon dioxide levels will likely cause, including an explanation of the equilibrium climate sensitivity concept.

Trends in Atmospheric Carbon Dioxide

Carbon Dioxide Information Analysis Center (CDIAC) - Graphs and downloadable data of carbon dioxide measurements from air smapling stations and ice cores.

Intergovernmental Panel on Climate Change

The offical website of the working group established by the United Nations Environment Programme and the World Meteorological Organization to assess human impacts on climate change.



Charles Keeling


On the influence of carbonic acid in the air upon the temperature of the ground

Svante Arrhenius's 1896 paper connecting major climatic changes to the carbon cycle.

News & Events

High Carbon Dioxide Levels Can Slow Plant Growth

Science Daily

Volcanic eruptions cause an increase in photosynthesis

Scientific American

Current Science News

News from around the world of science.


Jasper Ridge Global Change Experiment

Scientists study the effect that increased CO2 levels have on plant growth.

United States Carbon Cycle Science Program

An interagency partnership among various U.S. government agencies to coordinate and facilitate federally funded carbon cycle research.

Google Scholar

Google - Research database allows searching of the scholarly literature.


Personal Greenhouse Gas Calculator

EPA - an online calculator to obtain an estimate of a household's greenhouse gas emissions.

Next Generation Science Standards (NGSS)

Next Generation Science Standards: For States, By States

National Academies Press: A Framework for K-12 Science Education