Environment Technology

Environment Technology

Global Warming or a New Ice Age: Documentary Film

Posted by admin on August 17, 2012 in Global Warming with 15 Comments

Global cooling was a conjecture during the 1970s of imminent cooling of the Earth’s surface and atmosphere along with a posited commencement of glaciation. This hypothesis had little support in the scientific community, but gained temporary popular attention due to a combination of a slight downward trend of temperatures from the 1940s to the early 1970s and press reports that did not accurately reflect the scientific understanding of ice age cycles. In contrast to the global cooling conjecture, the current scientific opinion on climate change is that the Earth has not durably cooled, but undergone Global Warming throughout the twentieth century.

Concerns about nuclear winter arose in the early 1980s from several reports. Similar speculations have appeared over effects due to catastrophes such as asteroid impacts and massive volcanic eruptions. A prediction that massive oil well fires in Kuwait would cause significant effects on climate was quite incorrect.

The idea of a global cooling as the result of global warming was already proposed in the 1990s. In 2003, the Office of Net Assessment at the United States Department of Defense was commissioned to produce a study on the likely and potential effects of a modern climate change, especially of a shutdown of thermohaline circulation. The study, conducted under ONA head Andrew Marshall, modelled its prospective climate change on the 8.2 kiloyear event, precisely because it was the middle alternative between the Younger Dryas and the Little Ice Age. The study caused controversy in the media when it was made public in 2004. However, scientists acknowledge that “abrupt climate change initiated by Greenland ice sheet melting is not a realistic scenario for the 21st century”.

Currently, the concern that cooler temperatures would continue, and perhaps at a faster rate, has been observed to be incorrect by the IPCC. More has to be learned about climate, but the growing records have shown that the cooling concerns of 1975 have not been borne out.

As for the prospects of the end of the current interglacial (again, valid only in the absence of human perturbations): it isn’t true that interglacials have previously only lasted about 10,000 years; and Milankovitch-type calculations indicate that the present interglacial would probably continue for tens of thousands of years naturally. Other estimates (Loutre and Berger, based on orbital calculations) put the unperturbed length of the present interglacial at 50,000 years. Berger (EGU 2005 presentation) believes that the present CO2 perturbation will last long enough to suppress the next glacial cycle entirely.

As the NAS report indicates, scientific knowledge regarding climate change was more uncertain than it is today. At the time that Rasool and Schneider wrote their 1971 paper, climatologists had not yet recognized the significance of greenhouse gases other than water vapor and carbon dioxide, such as methane, nitrous oxide, and chlorofluorocarbons. Early in that decade, carbon dioxide was the only widely studied human-influenced greenhouse gas. The attention drawn to atmospheric gases in the 1970s stimulated many discoveries in future decades. As the temperature pattern changed, global cooling was of waning interest by 1979.


Duration : 0:54:13

Read the rest of this entry »

Technorati Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

Governments vs. Markets: Julian Morris on Environmental Protection

Posted by admin on May 29, 2012 in Environment Protection with 25 Comments

Which does a better job of protecting the environment: governments or markets?

Reason Foundation’s Vice President of Research Julian Morris spoke at Reason Foundation’s annual Reason Weekend and challenged the idea that regulations and energy subsidies will save us from environmental disasters. In fact, they help cause them.

When people are driven by profits and protected by property rights, Morris argues, environmentally friendly products will develop naturally.

Morris is the author of dozens of scholarly articles on issues ranging from the morality of free trade to the relationship between institutions, economic development and environmental protection.

Approximately 28 minutes.

Filmed by Alex Manning and Paul Detrick; Editded by Joshua Swain

Scroll down for downloadable versions and subscribe to Reason.tv’s YouTube channel to receive automatic notifications when new material goes live.

Duration : 0:28:37

Read the rest of this entry »

Technorati Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

Optimization WordPress Plugins & Solutions by W3 EDGE