You are here: Home / Climate Science / Recent Warming But No Trend in Galactic Cosmic Rays There is little evidence for a connection between solar activity (as inferred from trends in galactic cosmic rays) and recent global warming. Since the paper by Friis-Christensen and Lassen (1991), there has been an enhanced controversy about the role of solar activity for earth’s climate. Svensmark (1998) l

We noted earlier that the Artic sea-ice is approaching a record minimum. The record is now broken, almost a month before the annual sea-ice minima usually is observed, and there is probably more melting in store before it reaches the minimum for 2012 – before the autumn sea-ice starts to form. The figure shows annual variations in the area of sea-ice extent, and the x-axis marks the time of the ye

You are here: Home / Climate Science / Climate modelling / Cosmic rays and clouds: Potential mechanisms Guest Commentary by Jeffrey Pierce (Dalhousie U.) I’ve written this post to help readers understand potential physical mechanisms behind cosmic-ray/cloud connections. But first I briefly want to explain my motivation. Prior to the publication of the aerosol nucleation results from the CLOUD expe

After a record-breaking 2010 in terms of surface melt area in Greenland Tedesco et al, 2011, numbers from 2011 have been eagerly awaited. Marco Tedseco and his group have now just reported their results. This is unrelated to other Greenland meltdown this week that occurred at the launch of the new Times Atlas. The melt index anomaly is the number of days with detectable surface melt compared to th

Guest commentary from Dirk Notz, MPI Hamburg “Well, it’s not really good timing to write about global warming when the summer feels cold and rainy”, a journalist told me last week. Hence, at least here in Germany, there hasn’t been much reporting about the recent evolution of Arctic sea ice – despite the fact that Arctic sea ice extent in July, for example, was the lowest ever recorded for that mo

You are here: Home / Communicating Climate / Coldest Winter in 1000 Years Cometh. Not. This claim circulates in the internet and in many mainstream media as well: Scientists have allegedly predicted the coldest winter in 1,000 years for Europe. What is behind it? Nothing – no scientist has predicted anything like it. A Polish tabloid made up the story. An interesting lesson about today´s media. By

Translations: () This is Hansen et al’s end of year summary for 2009 (with a couple of minor edits). Update: A final version of this text is available here. If It’s That Warm, How Come It’s So Damned Cold? by James Hansen, Reto Ruedy, Makiko Sato, and Ken Lo The past year, 2009, tied as the second warmest year in the 130 years of global instrumental temperature records, in the surface temperature

This is a continuation of the last thread which is getting a little unwieldy. The emails cover a 13 year period in which many things happened, and very few people are up to speed on some of the long-buried issues. So to save some time, I’ve pulled a few bits out of the comment thread that shed some light on some of the context which is missing in some of the discussion of various emails. Trenberth

This site is a supplement to the RealClimate.org website. It is primarily an index for debunking of various popular media occurrences of climate-related nonsense. Articles are sorted by where they appear (outlet and country), or alphabetically by author. Under each article you will find links to rebuttals of specific arguments and overall critiques of the pieces. This is by no means comprehensive,

The blogosphere (and not only that) has been full of the “global warming is taking a break” meme lately. Although we have discussed this topic repeatedly, it is perhaps worthwhile reiterating two key points about the alleged pause here. (1) This discussion focuses on just a short time period – starting 1998 or later – covering at most 11 years. Even under conditions of anthropogenic global warming