No Change in Arctic Sea Ice
One of the mainstays of the global warming apocalyptics has been that the polar ice caps are melting and the seas are rising. It has even been claimed that the Arctic regions serve as an early warning system that global warming is on its way due to its supposed greater sensitivity to temperature change. In 1999, a paper published in the Geophysical Research Letters by Rothrock et al. suggested that Arctic ice was thinner in the 1990s than it was from 1958 to 1979.
A new study in the March 15 issue of GRL takes a closer look at the evidence. The 1999 study used data collected from submarine cruises from 1993, 96, and 97 and compared it to similar data from 1958 to 1979. The new study by Peter Winsor, with the Department of Oceanography, Earth Science Centre, at Gteborg University in Sweden, “carefully analyzed” the Rothrock results “using the most comprehensive data set presently available to the research community.”
The study concludes, “Draft data from the North Pole, and the Beaufort Sea, and transects between the two areas over a 7-year period from 1991 to 1997 show no evidence of a thinning ice cover.” Winsor goes on to show that by “Combining the mean drafts derived [from another study] from 1986 to 1990 with those from the present study, I conclude that the thickness of sea ice cover has remained on a near-constant level at the North Pole during the 12-year period from 1986 to 1997.”
If the Arctic is an early warning system of global warming as environmentalists claim, then judging by these results greenhouse gas emissions are not having any effect.
No Change in Climate
A new study in the March 29 issue of Nature has cast doubts on claims by environmentalists that the current climate is unprecedented. Indeed, if the results of the study are true, todays climate is typical of past interglacial warm periods.
The study analyzed tree ring data from partially fossilized remains of the conifer Fitzroya cupressoides or Alerce, the worlds second longest living tree. The trees, which can live to be as old as 3,600 years, died about 50,000 years ago. This gives scientists an opportunity to study a long period of the ancient climate system.
“The fine scale of the record reveals climate fluctuations that closely resemble those we are experiencing now, including the 25-year spell of El Nio oscillations,” noted a news story accompanying the study. According to the researchers, “Our study suggests that comparable cycles in tree growth occurred between interstadials of the last glaciation and today, and hence that similar factors have affected the radial growth of Fitzroya since the Late Pleistocene,” and that, “The forcing mechanisms of climate during the interstadials have not changed dramatically.”
Tropical Disease Cannot be Linked to Global Warming
The National Research Council announced a new study on April 2 looking at the impacts of climate change on human health. They found that, “It is not yet possible to determine whether global warming will actually cause diseases to spread,” according to a press release announcing the study. The diseases looked at include mosquito-borne diseases like dengue, malaria and yellow fever, influenza, intestinal disorders, and so on.
“Basic public health protections such as adequate housing and sanitation, as well as the availability of vaccines and drugs, can limit the geographic distribution of diseases regardless of climate,” said the release. “One example of this is along the border between the United States and Mexico, where dengue fever outbreaks are common just south of the Rio Grande in Mexico, but are rarely seen in neighboring regions just north of the river in the United States, mainly because of differences in socio-economic conditions.”
The printed study, Under the Weather: Climate, Ecosystems, and Infectious Disease, wont be released until this summer, but can be read online at http://nationalacademies.org/topnews.
Enhanced Greenhouse Effect Needed
A new study in Astrophysics and Space Science (275: 2001) by internationally renowned scientists Fred Hoyle and Chandra Wickramasinghe presents a new theory of climatic change. According to them, the earths natural state is the extreme coldness of the ice ages, and the earth would remain in such a state forever if not for the periodic collision with large comets.
One-kilometer size comets have a probability of hitting the earth about once every 100,000 years, which coincides with the average periodicity of ice ages. When one of these comets hits the earths oceans, it ejects enough water vapor into the atmosphere to “jerk the earth almost discontinuously out of a long drawn-out ice-age into the beginning of an interglacial.” Afterwards, the earth gradually returns to its normal frozen state.
What are the implications for global warming? According to Hoyle and Wickramasinghe, “We must look to a sustained greenhouse effect to maintain the present advantageous world climate.” They warn, “The renewal of ice-age conditions would render a large fraction of the worlds major food-growing areas inoperable, and so would inevitably lead to the extinction of most of the present human population.” Indeed, “Without some artificial means of giving positive feedback to the climate, …an eventual drift into ice-age conditions appears inevitable,” they said.
They have harsh words for those who support greenhouse gas regulations. “Manifestly, we need all the greenhouse we can get,” they said. “Those who have engaged in uncritical scaremongering over an enhanced greenhouse effect raising the Earths temperature by a degree or two should be seen as both misguided and dangerous.” The current danger “is of a drift back into an ice-age, not away from an ice-age.” For a longer review of the study see www.co2science.org.