Is the planet in fact warming- HROmedia latest news

February 24, 2013 | By More

This crucial question cannot be answered honestly unless one specifies the time interval referred to. Clearly, the climate has warmed since the last Ice Age.

planet fact warningIt has also warmed since about 1850, in recovering from the Little Ice Age (roughly 1400-1800
AD). But is has not warmed since the Medieval Warm Period of 1,000 years ago, or since the
Holocene Optimum, which reached even higher temperatures 5,000-8,000 years ago. Nor has it
warmed during the past decade.

Coming closer to the present, we see a warming between 1910 and 1940, which is real but not
caused by human activities.

Most would agree that the Earth’s surface cooled slightly between 1940 and 1975—even though carbon dioxide, a greenhouse (GH) gas, had been steadily increasing during this period.

Temperature data show a sudden, unexplained jump around 1976-1977. Surface weather stations then report a modest increase in temperature up to the year 2000—although different analyses disagree on details and have been frequently revised.

Many people, including Nordhaus, tend to identify this reported increase as caused by the almost parallel increase in CO2. In its Summary, the latest IPCC report (2007) states explicitly that this reported warming trend is sure evidence for anthropogenic global warming .

We note, however, that the atmosphere, both over land and ocean, did not warm
during this same post-1978 period—even though atmospheric theory and every climate
model predicts that the tropical atmosphere should warm nearly twice as rapidly as
the surface. This atmospheric evidence comes from instruments in weather satellites,
producing the only truly global data—and, independently, from thermometers in
balloon-borne radiosondes.

In 2000, the U.S. National Academy of Sciences assembled a team of distinguished
scientists to discuss the puzzle of surface warming in the absence of an atmospheric
warming trend. However, their report, “Reconciling observations of global temperature
change,” could not reconcile the disparity.

I note that an analysis of ocean data has shown no significant warming during the period
of 1978 -2000. Independent non-thermometer data (so-called proxies, like tree rings, ice
cores, ocean sediments, stalagmites, etc.) also show no warming trend between 1978
and 2000. Significantly, there has been no warming for the past decade. All this, in spite
of constantly rising CO2 levels.

The inescapable conclusion—or perhaps I should say suspicion—is that land-based weather
stations may be reporting just local temperature increases but that there is negligible global
warming. If correct, this surmise would remove the main evidence for the IPCC’s claim about
the existence of appreciable AGW.

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Category: Environment

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