Climate ‘skeptics’ down-play the sensitivity of Earth’s climate to increased CO2 emissions and concentrations, and so might some policy makers. In the end, it’s the emissions and concentrations that most matter rather than uncertainties about climate sensitivity.

‘Multiple independent lines of evidence.’ Get used to hearing that term in reference to the past year’s record warmth across the contiguous United States and the near-record global temperatures too. The long-range forecast: a hotter planet by the end of [...]

The year’s increased Antarctic sea ice levels cannot be seen as undercutting the long-term record decline in Arctic sea ice and the global sea ice decline generally.

A second strategically-timed unauthorized release of climate scientists’ e-mails dating from 2009 apparently seeks to disrupt international climate negotiations in Durban, South Africa. But the newly released materials, while not always flattering to authors or participants, shed little light on [...]

‘BEST’ researchers release not-yet-peer-reviewed findings supporting validity of temperature station records and rejecting urban heat island arguments. Climate ‘skeptics,’ having anticipated good news, cry foul … and climatologists long supportive of the evidence wonder, ‘So? What’s New?’

There’s a lesson to be learned from an editor’s having resigned over his journal’s publication of a research report thought to have been inadequately reviewed: extraordinary claims must be supported by extraordinary evidence. Headline writers and media … take note.

A recent analysis concluding that natural gas from shale poses more climate change problems than combustion of coal rests heavily on a problematic time frame. In the end, the widely reported article may do more to muddle understanding of natural [...]