Global Warming: Brief Essay on Global Warming
The Asia Pacific region remains prone to further increase in sea level and climate change. Rising sea levels are believed to affect a significant number of countries in the region, particularly countries like Bangladesh, the Maldives and Vietnam. How are Asian countries responding to climate change? Are some countries more environmentally friendly than others? This and more will be covered in the upcoming report.
Global Warming: Short Essay on Global Warming
This essay has presented Earth’s many changing faces during its journey. Earth had molten beginnings, was , and may have . Later, and and . Earth experienced swings from to conditions as atmospheric gases dramatically changed, continents moved, and vast and of complex life played out on land and sea. But the changes happened over timescales of millions and billions of years, not hundreds. No climate scientist will deny that carbon dioxide traps infrared radiation and warms Earth’s atmosphere. The vented enough carbon dioxide into the atmosphere to create 200 million years of Greenhouse Earth conditions, when reptiles ruled Earth. Volcanism waned and around 150-to-100 mya. By 35 mya, and the Antarctic ice sheet began forming. Every paleoclimate study I have seen places greenhouse gas (and primarily carbon dioxide) concentrations as the primary determinant of global surface temperatures, after the Sun's radiation, but the Sun's output is considered to have been exceptionally stable and has risen slowly over the eons. , usually by accentuating the carbon dioxide with a positive feedback effect that may have reached runaway conditions at times.
There are four distinct phases/components to this geo-atmospheric dynamic which has been intensifying over several decades. The diagram below illustrates their interaction with each other. The ice-albedo feedback* is particularly significant because of how it is manifesting across the Arctic nations, especially Greenland. The last few years have seen a dramatic increase in both snowmelt and icemelt throughout this region due to global warming.
Global Warming Conclusion Free Essays
The Oligocene ended with a sudden global warming that continued into the (c. 23 to 5.3 mya). The Miocene was also the first epoch of the (c. 23 to 2.6 mya). Although the Miocene was , England had palm trees again, Antarctic ice sheets melted, and oceans rose. The Miocene is also called the Golden Age of Mammals. Scientists still wrestle with why Earth’s temperature increased in the late Oligocene, but there is no doubt that it did. As the has demonstrated, many dynamics impact Earth’s climate, and positive and negative feedbacks can produce dramatic changes. For the several million year warm period, carbon dioxide levels do not appear to have been elevated. That data has been seized on by as evidence that carbon dioxide levels have nothing to do with Earth’s temperature, but climate scientists not rarely think that way. Carbon dioxide is only one greenhouse gas, and . But as clouds demonstrate, water is notoriously ephemeral, constantly evaporating and precipitating, and some land can get a lot (rainforests), and some can get very little (deserts). Icehouse Earth temperatures are more variable than Greenhouse Earth temperatures, particularly during the transitions between states, and an Icehouse Earth atmosphere contains less water vapor than a Greenhouse Earth atmosphere.
Global warming Essay - Paper Topics
For several million years, life in the Eocene was halcyonic, and at 50 mya, the state had prevailed ever since the 250 mya. But just as , Earth began cooling off. The ultimate reason was atmospheric carbon dioxide levels that had been steadily declining for tens of millions of years. The intense volcanism of the previous 200 million years waned and the inexorably sequestered carbon into Earth’s crust and mantle. While falling carbon dioxide levels were the ultimate cause, the first proximate cause was probably the isolation of Antarctica at the South Pole and changes in global ocean currents. During the early Eocene, the global ocean floor’s water temperature was about 13oC (55oF), warm enough to swim in, which was a far cry from today’s near-freezing and below-freezing temperatures. The North Sea was warm as bathwater. Radical , warming the ocean floor, and . Whatever the causes were, the oceans were warm from top to bottom, from pole to pole. But between 50 to 45 mya, Australia made its final split from Antarctica and moved northward, India began crashing into Asia and cut off the Tethys Ocean and the global tropical circulation, and South America also moved northward, away from Antarctica. Although the debate is still fierce over the cooling’s exact causes, the evidence (much is from ) is that the oceans cooled off over the next 12 million years, very consistently, although a brief small reversal transpired at about 40 mya. By 37-38 mya, the 200-million-year-plus Greenhouse Earth phase ended and the transition to today’s ice age was underway. In the late Eocene, as the trend toward conditions began, such as the .
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Polar forests reappeared in the Eocene after the , and the Eocene’s was the Cenozoic’s warmest time and . Not only did alligators live near the North Pole, but the continents and oceans hosted an abundance and diversity of life that Earth may have not seen before or since. That ten million year period ended as Earth began cooling off and headed toward the current ice age, and it has been called the original Paradise Lost. One way that methane has been implicated in those hot times is that leaves have , which regulate the air they take in to obtain carbon dioxide and oxygen, needed for photosynthesis and respiration. Plants also lose water vapor through their stomata, so balancing gas input needs against water losses are key stomata functions, and it is thought that in periods of high carbon dioxide concentration, . Scientists can count stomata density in fossil leaves, which led some scientists to conclude that carbon dioxide levels were not high enough to produce the PETM, so that produced the PETM and , and the controversy and research continues.