Category: Climate

May 16 2010

CO2 hits 390 ppm

The level of carbon dioxide (CO2) in the atmosphere, as measured at Mauna Loa, has just ticked over to 390 ppm. Actually, that’s not quite true — the level is 392.39 ppm as of April. But CO2 levels are slightly higher during the northern spring than the southern spring, because the Northern Hemisphere has more …

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May 12 2010

Global Warming Contrarians Part 2.1: Cooling Trend or Noise?

In Part 2 of this series of posts examining the (mostly bad) arguments against the reality of global warming, I debunked the oft-heard claim that global warming stopped in 1998. Basically, the people who make that claim are just joining endpoints, rather than looking at the trend from 1998 to now. But there is a …

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Apr 30 2010

Global Warming Contrarians Part 6: Global Cooling in the Mid-20th Century

Here, at last, is the much-delayed sixth instalment in my ongoing series of posts on the (mostly bad) arguments that contrarians make against global warming. (A list of earlier parts in the series can be found here.) In this post, I want to clear out of the way one more factoid that contrarians hold up …

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Apr 17 2010

Introducing “2010 Global Temperature Watch”

There’s a good chance that 2010 will be the warmest year in the global surface temperature record. So I figured it’s worth keeping an eye on global temperatures this year. I’ll be posting regular updates on a new page called “2010 Global Temperature Watch”. Here’s a sample: 16 April 2010 According to NCDC, the global …

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Mar 27 2010

Global Warming Contrarians Part 5: Counting Carbon

This is the latest instalment in a continuing series of posts on the (mostly bad) arguments that contrarians make against global warming. A list of earlier parts in the series can be found at the bottom of this post. Claim: Natural CO2 emissions far outweigh our own. Fact: This claim is true but misleading. Before …

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Mar 23 2010

Global Warming Contrarians Part 4: Back to Basics

So far in my series of posts on the arguments contrarians make against global warming, I’ve written about the changes being observed in the Earth’s climate. I wrote about whether the global temperature has increased (short answer: yes); whether it has recently stopped increasing (short answer: probably not); and whether ice is declining around the …

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Mar 13 2010

Global Warming Contrarians Part 3: Hiding the Decline of Ice

In 2007, the Fourth Assessment Report (AR4) of the Intergovernmental Panel on Climate Change (IPCC) concluded that global warming is unequivocal, and that serious impacts of global warming are already beginning to occur. The AR5 isn’t due until 2013, but in 2009, a non-IPCC report called the Copenhagen Diagnosis was released to provide an update …

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Feb 20 2010

Global Warming Contrarians Part 2: 1998, El Niño, and Ocean Heat Content

This is the second in a series of posts on the arguments contrarians make against global warming. In Part 1, I discussed long-term global temperature trends, criticisms of the surface temperature record, and cold weather. And without further ado, I’ll continue by looking at another popular claim about global temperatures… Claim: Global warming stopped in …

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Feb 13 2010

Why the Global Warming “Skeptics” Are Wrong – Part 1: Tracking Temperatures

Mark Twain once said, or at least is supposed to have said: “A lie can travel halfway around the world while the truth is putting on its shoes.” The climate change contrarian blogosphere that has recently emerged is rather like that. Every month, there is some new argument being passed around that “disproves” global warming …

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