Human emissions of carbon dioxide (CO2) are the primary factor contributing to the warming of the Earth’s surface over the past half-century. However, for the past few years global temperatures have been stagnant or slightly decreasing even as atmospheric CO2 [...]

The recent brouhaha (see related story, this posting) initiated by conservative columnist George Will’s February 15th syndicated column centers in part around his assertion that global sea ice levels now equal those of 1979, belying concerns of melting ice caps.

In reporting on climate change, the carbon, carbon dioxide (CO2), greenhouse gases, radiative forcing, and CO2-equivilent (CO2-eq) are often used almost interchangeably to refer to the human contribution to recent warming.

It is difficult these days to find an article about climate science without some mention of tipping points and the risk of abrupt climate change. Some prominent climate scientists and policy proponents have warned ominously that we have only a [...]

A voluntary market for carbon offsets has emerged in recent years in the United States that in many ways parallels the global compliance carbon market in countries that have signed onto the Kyoto Protocol. In contrast to the strict regulatory [...]

The global market for carbon reductions is growing rapidly, having doubled in value in the last year alone to more than $64 billion. The European Union Emissions Trading System (EUETS) comprises most of the market, with the Clean Development Mechanism [...]

With all the attention surrounding carbon dioxide these days, it is easy to forget that there are a number of other important natural and human-driven factors (“forcings” in climate circles) that influence Earth’s climate.