Dinosaur Extinction: Currents Theories and Explanations
Mass extinctions of plants and animals have occurred many times in the history of the earth, one of the most widely known being that of the dinosaur over 65 million years ago. Many theories as to why the dinosaurs became extinct exist, including volcanic eruptions, changes in climate, diseases, radiation form a nearby supernova, and giant meteor and/or comet impacts. Although loyal believers back all of these theories, no one single theory has been accepted by the scientific community as a whole (Blanchard, 1999).

Most theories surrounding dinosaur extinction revolve around the era of time known as the K-T boundary, the period between the Cretaceous period and the Tertiary period. Supporting evidence of this time frame exists in the fossils found throughout the Mesozoic era, while no such fossils exist for the Cenozoic era (Blanchard, 1999). Yet using fossils to either prove or disprove a theory….

Dinosaurs: arm-Blooded?
There is presently much controversy regarding the issue of dinosaurs, as the fact that experts have access to a limited amount of resources concerning this matter makes it difficult for them to express certainties concerning this particular animal reign. Even with the fact that there are presently no living dinosaurs to be dissected, scientists have come up with a series of theories based on how dinosaurs behaved. In spite of their physiology, most dinosaurs put across behavior characteristic to mammals and birds. One of the oldest debates in the history of dinosaur studies is related to the blood temperatures of these creatures, as some experts insist that they were cold-blooded while others maintain that they were warm-blooded. The presence of dinosaur fossils at high altitudes makes it possible for one to consider that dinosaurs were warm-blooded, taking into account that cold-blooded creatures typically evolve in warm areas.

All living bodies….

Dinosaurs are a popular topic with young students of both genders and all ethnicities. Because they are extinct, dinosaurs generally take on a mythic character among children of this age; furthermore, because they are physically enormous and dominant, most students find them fascinating as almost fantasy creatures. Therefore, creating a thematic unit on dinosaurs for first and second graders was fun and rewarding. With the plethora of material available on the subject, tailoring a unit for my students also involved a thorough review of films, books, websites, and CD ROMs. I relied heavily on multimedia materials, as dinosaurs' main impact for students is visual and aural. I employed Internet and CD Rom sources in addition to picture books and a brief cartoon film. These visual tools proved engaging for most students, who would otherwise become bored with pure fact and data. I based the success of the lesson on the….

Deposition occurred over a very long time period. The study found that the sediments separating the two events were characteristic of normal sedimentation, with burrows formed by creatures colonizing the ocean floor, erosion and transportation of sediments, and no evidence of structural disturbance" which means that there is no reason to believe that the asteroid impacted normal life in measurable fashion very quickly, or that fossil evidence of the asteroid's impact had been disrupted (New blow against dinosaur-killing asteroid theory, geologists find, 2009, National Science Foundation).
Even defenders of the asteroid theory think it is unlikely that it was a one-time event that killed most of the life on planet earth, and believe that the asteroids created inhospitable conditions that developed over time. Recent research also indicates that the asteroid "landed in deeper water than previously assumed and therefore released about 6.5 times more water vapor into the atmosphere. The….

..the giant salamander, 2010, Cryptozooscity).
There are fears that giant salamanders may meet the same fate as dinosaurs, given that modern life has exposed them to quick-moving, larger-brained humans who consider them a delicacy and will hunt them with greater determination than previous predators. The amphibian's size makes them "lucrative prey for hunters, who can sell the flesh for around U.S.$100 per kg (£30 per lb)," a considerable sum when one salamander can grow to over one hundred pounds (Black 2005). "They are protected species; but in China, illegal hunting is bringing them within sight of extinction" (Black 2005). Observed one conservationist: "They are easy to catch, hiding in rock crevasses during the day, and people know where to find them" (Black 2005).

The loss of these giant relics would not merely be a loss of a link to human evolutionary history of the past: the salamanders may also provide humans with….

However, there simply does not seem to be sufficient evidence for the disease hypothesis. First, there has been no evidence of disease found. Next, even extremely virulent diseases, like the plague or West Nile Virus, do not have the kill rates necessary to cause the extinction of an entire species. In addition, one has to realize that the extinction of large mammals coincided with the extinction of other animals, like birds, marsupials, placentals, testudines, and crocodilians. It is unlikely that a disease would be lethal in such a wide-variety of animal populations, especially when it did not destroy all species of certain animal genus.
The final theory is that a meteor killed the large mammals. There is evidence that meteor impacts caused earlier extinctions like the Permian-Triassic extinction and the extinction of the dinosaurs. Meteor impacts can interfere with food sources, because the resulting dust in the air interferes with….

Without the mass extinction of the dinosaurs, is doubtful that human beings would ever have evolved in the first place. By comparison to the effects of the that meteorite, all of the human activity in the world that has ever occurred since the first human being who hunted for prey or started a fire is infinitesimally small and utterly insignificant.
More importantly, human concern for animal species extinctions seems to be largely predicated on our anthropomorphic impulses: that is, we have the greatest empathy for animals that remind us of ourselves or that seem appealing or "cute" to us. Consider the different way that we regard tuna and dolphin for just one example. We hunt the former so aggressively that we are on the verge of having to maintain wild tuna populations artificially if we hope to continue eating as much sushi and tuna fish sandwiches as we wish. Other….

He describes how wild grains and animals were domesticated, as well as the new technologies that made farming possible (sickles, baskets, pestles, gourds, irrigation, the wheel, the plow). He uses a chart to plot these movements. His evidence is mainly archeological, historical, and botanical with heavy doses of appeal to imaginary scenarios. Its power to convince is narrational. His ultimate point in cataloguing this change is to assert how, for first time in history, humans become a prime factor in altering earth's natural landscapes. Land was now exploited and degraded through deforestation for crops and soil erosion.
Summary: Ruddiman summarizes the history of how humans began to shape the earth through technology and landscape transformation. He relies on the credibility of his narrative.

Ch. 8, pp. 76-83: His main claim is that humans rather than nature have created a rise in atmospheric methane. He presents several lines of argument, beginning with….

From the point-of-view of the variation and flexibility of the species such cultivated woody crops rank as no more than cornfields. While the tree farms are conveniently be stretched on the private lands, national forests those are considered priceless reservoirs of most of the biological diversity of the nation cannot expand so easily. The commercial logging is considered as the greatest danger for survival of the national forest system. The timber sales are growingly concealed beneath the post fire recovery and fire prevention missions, forest health initiatives and restoration programs. (Endangered Forests: Endangered Freedoms)
Wetlands disappearing

Declining wetlands and reservoir construction are having spectacular influences on a global scale. (the Importance of Wetlands and the Impacts of eservoir Development) the data of USF & WS reveals that the United States added 2.3 million acres in ponds and inland mudflats during the period of mid 1950s and mid1970s. The country added about….

Furthermore, he argues, a technological culture is not an inevitable feature of human evolution. If other cultures had achieved ascendancy, then science and technology would not have emerged as a reference point for measuring intelligence. SETI's requirement for an almost identical technology, although scientifically understandable, is based on an impoverished concept of intelligence.
According to Munevar, the development of a scientific culture, with access to radio communication, is highly contingent, requiring a number of lucky breaks from the environment and human natural and social history. In this context Munevar cites the development of mammalian intelligence. It is widely believed that the dinosaurs were wiped out by the immediate effects of an asteroid or cometary impact or possibly volcanic eruption. But mammals who survived the years of darkness caused by the dust of the impact or eruption then evolved to occupy the niche held by the dinosaurs. If the dinosaurs had….

components to the principle of uniformitarianism: the first is that the principles that can be applied to the Universe nowadays have always been applicable in the same manner. The second implies that these principles occur and are applicable everywhere in the Universe. With this in mind, if occasional catastrophic events such as the ones described have occurred in the past on Earth, they could occur again, in a similar manner, today or in the future. So, if the dinosaurs became extinct following a meteorite impact, another such impact could hit the Earth in a similar manner, leading to another large scale extinction.
Geologic processes include diverse ways in which the Earth's surface is modeled. These include soil erosion or desertification. If an area has been significantly eroded, this could lead to devastating floods. At the same time, other geologic processes can lead to tsunamis. As a consequence, it is obvious….

But the supply far outstrips demand, Europeans are finding. The climate of this marketplace itself is decidedly cloudy. Advance prices have plunged by half.

At this point, one shouldn't portray it as a liquid, vibrant market," said Atle C. Christiansen of PointCarbon, a Norway-based research firm (Climate, 2004).

More than six years after governments negotiated the historic climate accord in Kyoto, Japan, the world is taking only halting steps _ not always forward, never in unison _ to follow through (Climate, 2004).

In fact, the Kyoto treaty itself is not yet in force, since it hasn't been ratified, as required, by industrial countries emitting a total of 55% of "greenhouse gases," such as carbon dioxide, that trap heat in the atmosphere that Earth otherwise would give off.

ussia's expected accession later this year would clear the 55% hurdle. But even a functioning Kyoto agreement would have little impact: Its limited reductions would barely slow….

TED Talks
Ideas worth Spreading

Nina Jablonski breaks the illusion of skin color (TED2009, 2009)

Nina Joblonski opens by commenting on Darwin's pigmentation and his upbringing. She further speaks of his voyage on the Beagle and his interest in the pigmentation of humans. Darwin did not believe that there was any correlation to skin pigmentation and climate. However, Joblonski points out that if Darwin had access to NASA satellites that he may have come to a different conclusion. One of NASA's satellites has capabilities to monitor the Earth's radiation close to the surface. As a result, researchers today have been able to study skin pigmentation and the exposure to solar radiation and find that there is a perfect gradient and strong correlation between the two.

Therefore, skin color is a product of evolutionary forces as human adapted to their environments and their skin adapt to the levels of radiation that they were receiving. The….

Godzilla (1954) was the original science fiction class that inspired a large number of sequels over the next twenty years, and as usual with this genre reflected contemporary Cold War fears and anxieties about nuclear weapons. In this case, hydrogen bomb tests is the Pacific created a radioactive dinosaur that made its way bad to Japan and destroyed okyo. Japan's cities had been firebombed into destruction during World War II, and it was the only country in history to ever experience a nuclear attack -- just nine years before this film was made -- so the idea that some prehistoric monster might devastate the country had a special relevance there. In the 1950s, of course, there were many science fiction films about radioactive monsters, such as the giant ants in hem or the dinosaur that attacked London in Behemoth, so the symbolism of these mutations destroying the world was commonplace.….

Also the alternative voice over IP providers such as Vonage, at & T. is expected to enhance the market share during the period. The demand for wireless connectivity by the direct consumers will also increase having wide choices to choose from like 3G, Wi-Fi, WiMAX. The SSLs and VPNs will dominate in the field of single-user remote access while the IPSec based installations will be resorted to in respect of the network-to-network use. And finally the WiMAX-based services are expected to influence the overall market.
eferences

Carew, Sinead. "WiMax May Pose Fresh Challenge to Broadband" (3 February, 2005)

etrieved at http://www.reuters.com/newsArticle.jhtml?type=technologyNews&storyID=7749299. Accessed on 10 March, 2005

Gabriel, Caroline. (2005) "WiMAX Ambitions Depend on Success in Newly Available

Spectrum" etrieved at http://www.wimaxtrends.com/feature.htm. Accessed on 10 March, 2005

Home Entertainment Networks" (2002) etrieved at http://www.ruleweb.com/wdvl/homenetworking.pdf. Accessed on 10 March, 2005

ILECs Headed for Extinction, According to META Group" (January 30, 2005)

The Industry Analyst eporter. etrieved at http://www.industryanalystreporter.com/T2/Analyst_esearch/esearchAnnouncementsDetails.asp?Newsid=4405Accessed on….