Amsterdam, Netherlands -- Global warming is speeding the release of carbon dioxide, a chief greenhouse gas, from underground peat forms in subarctic wetlands, Dutch research indicates.

State College, Pa. -- U.S. scientists say they have discovered marine microorganisms use manganese and iron to convert methane into carbon dioxide.

Vancouver, British Columbia. -- Canadian zoologists have determined elevated water temperatures and high carbon dioxide concentrations can boost the growth of a species of sea star.

Edgewater, Md. -- U.S. marine scientists say they have discovered that rising levels of atmospheric carbon dioxide are threatening shellfish populations in many ecosystems.

Ann Arbor, Mich -- U.S. scientists say they have developed a concrete material that can heal itself when it cracks with only water and carbon dioxide needed.