Concocting A Climate “Cover Up”


After the Daily Mail falsely accused scientists of “cover[ing] up” temperature data based on leaked comments to the world's preeminent climate report, conservative media, including the Daily Caller, are once again adopting the British tabloid's misinformation verbatim. However, the comments actually showed scientists and governments making the same points privately that they have made publicly about why the slightly slower rate of warming in the last 15 years doesn't undermine the overwhelming science showing long-term climate change.

A recent Associated Press article showed that leaked private comments on the upcoming comprehensive U.N. Intergovernmental Panel on Climate Change (IPCC) report reflect what scientists have been saying publicly: despite experiencing the warmest decade on record from 2000-2010, the planet is heating up at a slightly slower rate -- but this in no way undermines the science demonstrating manmade climate change is occurring. What the AP report -- which tried to turn into "Climategate II" --  described was a debate over how to best explain this to the public. During the exchange in question, representatives of various governments pointed  out that cherry-picking 1998 as a starting point for global temperatures trends is misleading because that year had record warmth, and this short time period does not undermine the long-term warming trend.

Source: Skeptical Science

Somehow, the Daily Mail used this to say that “it is claimed” that scientists producing the IPCC report “were urged to cover up the fact that the world's temperature hasn't risen for the last 15 years.” The paper didn't actually provide anyone who has alleged this.

The draft report and comments also show several experts pointing out that scientists are conducting ongoing research about the extent to which this phenomenon is based on heat being trapped in the oceans or various temporary natural cooling factors in order to better project the exact future impacts of climate change.

Far from a “cover up,” however, these are all points that have been made publicly. Here's the UK Met Office publicly explaining that picking a short time period to look at temperature data, especially one that starts in 1998, can be “misleading”:

As we've stressed before, choosing a starting or end point on short-term scales can be very misleading. Climate change can only be detected from multi-decadal timescales due to the inherent variability in the climate system. If you use a longer period from HadCRUT4 the trend looks very different. For example, 1979 to 2011 shows 0.16°C/decade (or 0.15°C/decade in the NCDC dataset, 0.16°C/decade in GISS). Looking at successive decades over this period, each decade was warmer than the previous - so the 1990s were warmer than the 1980s, and the 2000s were warmer than both. Eight of the top ten warmest years have occurred in the last decade. Over the last 140 years global surface temperatures have risen by about 0.8ºC. However, within this record there have been several periods lasting a decade or more during which temperatures have risen very slowly or cooled. The current period of reduced warming is not unprecedented and 15 year long periods are not unusual.

And here's a scientist publicly explaining that deep oceans may be absorbing much of recent heat, masking warming in the short-term, as reported by Science Daily:

The [National Center for Atmospheric Research] study, based on computer simulations of global climate, points to ocean layers deeper than 1,000 feet (300 meters) as the main location of the “missing heat” during periods such as the past decade when global air temperatures showed little trend. The findings also suggest that several more intervals like this can be expected over the next century, even as the trend toward overall warming continues.

“We will see global warming go through hiatus periods in the future,” says NCAR's Gerald Meehl, lead author of the study. “However, these periods would likely last only about a decade or so, and warming would then resume. This study illustrates one reason why global temperatures do not simply rise in a straight line.”

Source: Skeptical Science

Conservative media have used the speed bump in warming to ask if we should just forget about climate change. Instead, perhaps we should be asking ourselves: if record Arctic sea ice melt and sea level rise is what the speed bump looks like, what does the road ahead resemble?