Here is your short essay on Our Planet - The Earth

In the Fertile Crescent today, the ruins of hundreds of early cities are in their self-made deserts, usually buried under the silt of the erosion of exposed forest soils. As the Mediterranean Sea’s periphery became civilized, the same pattern was repeated; forests became semi-deserts and early cities were buried under silt. Before the rise of civilization, a forest ran from Morocco to Afghanistan, and only about 10% of the forest that still existed as late as 2000 BCE still remains. Everyplace that civilization exists today has been dramatically deforested. Humanity has since agriculture began. The only partial exceptions are places such as Japan, but they regenerated their forests by importing wood from foreign forests. North America and Asia have been supplying Japan with wood for generations. As civilizations wiped themselves out with their rapaciousness, some people were aware enough to lament what was happening, but they were a small minority. Usually lost in the anthropocentric view was the awesome devastation inflicted on other life forms. was only a prelude. Razing a forest to burn the wood and raise crops destroyed an entire ecosystem for short-term human benefit and left behind a lifeless desert when the last crops were wrenched from depleted soils. In the final accounting, the damage meted out to Earth’s other species, not other humans, may be humanity’s greatest crime. Humanity is the greatest destructive force on Earth since the , and our great task of devastating Earth and her denizens may be .

Short Essay on Earth (290 Words)

Short Essay on Earth (290 Words) ..

Short Essay On Planet Earth Free Essays - StudyMode

For this essay’s purposes, the most important ecological understanding is that the Sun provides all of earthly life’s energy, either (all except nuclear-powered electric lights driving photosynthesis in greenhouses, as that energy came from dead stars). Today’s hydrocarbon energy that powers our industrial world comes from captured sunlight. Exciting electrons with photon energy, then stripping off electrons and protons and using their electric potential to power biochemical reactions, is what makes Earth’s ecosystems possible. Too little energy, and reactions will not happen (such as ice ages, enzyme poisoning, the darkness of night, food shortages, and lack of key nutrients that support biological reactions), and too much (such as , ionizing radiation, temperatures too high for enzyme activity), and life is damaged or destroyed. The journey of life on Earth has primarily been about adapting to varying energy conditions and finding levels where life can survive. For the many hypotheses about those ancient events and what really happened, the answers are always primarily in energy terms, such as how it was obtained, how it was preserved, and how it was used. For life scientists, that is always the framework, and they devote themselves to discovering how the energy game was played.

Short essay on the Structure of planet Earth

The , which began 443 mya, is short for the , lasting “only” 24 million years and ending about 419 mya. The Silurian was another relatively hot period with shallow tropical seas, but . But the ice caps eventually shrank, which played havoc with the sea level and caused minor extinction events (, , ), the last of which ended the Silurian and also created more Middle East oil deposits. Reefs made a big comeback, extending as far as 50 degrees north latitude (farther north than where I live in ). According to the model, oxygen levels rose greatly during the Silurian and rebounded from a low in the mid-Ordovician; it may have reached 25% by the early Devonian, which followed the Silurian. Coincident with rising oxygen levels, more giants appeared. Scorpion-like were the largest arthropods ever, and the near the Devonian’s oxygen highpoint. The first land-dwelling animals - , , and - came ashore during the Silurian between 430 mya and 420 mya. The appeared and of the first insects ., Donald Canfield believed that the gigantism among arthropods and other oxygen effects were due to Earth's atmosphere beginning to reach modern levels for the first time in the eon of complex life, not that it reached higher than modern levels. I expect the oxygen controversy to outlive me.

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Using google earth short essay on pollution.

Short essay on save planet earth

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.

Essay on the Important Zoogeography regions of Planet Earth

The Earth is not only a planet where we live in, ..

Did the larger brain lead to the behaviors, or did the behaviors lead to the larger brain? If other evolutionary trends have relevance, they mutually reinforced each other and provided positive feedbacks; down one evolutionary line it reached conditions that led to the human brain. The initial behavior was probably the use of a body part (the brain) for a new purpose, and its success led to selective advantages that led to mutual reinforcement. Although it is by no means an unorthodox understanding, I think that the likely chain of events was walking upright freed hands for new behaviors, which led to new ways of making and using tools, which enhanced food acquisition activities. This allowed the energy-demanding brain to expand, as well as related biological changes, which led to more complex tools and behaviors that acquired and even more energy. That, in short, defines the human journey to this day, which the rest of this essay will explore. There has never been and probably never will again be an energy-devouring animal like humanity on Earth, unless it is a human-line descendant.

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As far as we know, Earth is the only planet that has ..

By 1300, Earth was cooling down, High Middle Ages Europe was largely deforested, and nearly all arable land was under the plow. Europe had reached the Malthusian limit of its means of preindustrial production. The 1300s were a century of unending calamity for Europe, beginning with famines in 1304, 1305, and 1310, and a that lasted three years. Famines visited Europe at least once a generation in the 1300s. In 1337, England and France . Those events were only a hint at what lied ahead. Plagues and famines tend to be conjoined: weakened bodies are susceptible to disease. The Black Death pandemic probably originated in war-torn and famine-plagued China . In 1346, it reached Europe. By 1350, and . War, famine, and epidemics were so prevalent in the 1300s that the became an art form in the 1400s and 1500s, after the . Europe became a hell on Earth. But the work that watermills performed was not subject to famine and disease, and the work of millions of “energy slaves” surely helped hold Europe together. Labor was in such shortage after the catastrophes that .