This could mean an additional , cases per year world wide. UV -B radiation can damage several parts of the eye, including the lens, the cornea, and the membrane covering the eye conjunctiva. Snow blindness is not unlike a sunburn, and if repeated, can cause damage to eye over the long term. Cataracts are a clouding of the eye's lens and are the leading cause of permanent blindness world wide. They are a result of overexposure to UV. UV affects our ability to fight disease.
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The body's immune system is its first line of defense against invading germs. Recent research has shown that some viruses can be activated by increased exposure to UV. Ultraviolet radiation not only affects humans, but wildlife as well. Excessive UV -B inhibits the growth processes of almost all green plants. There is concern that ozone depletion may lead to a loss of plant species and reduce global food supply. Any change in the balance of plant species can have serious effects, since all life is interconnected. Plants form the basis of the food web, prevent soil erosion and water loss, and are the primary producers of oxygen and a primary sink storage site for carbon dioxide.
UV -B causes cancer in domestic animals similar to those observed in humans. Although most animals have greater protection from UV -B because of their heavy coats and skin pigmentation, they cannot be artificially protected from UV -B on a large scale. Eyes and exposed parts of the body are most at risk. Although the ozone layer is the one constant defense against UV penetration, several other factors can have an effect:. Since the sun's rays impact the Earth's surface at the most direct angle over the equator they are the most intense at this latitude.
During winter months, the sun's rays strike at a more oblique angle than they do in the summer. This means that all solar radiation travels a longer path through the atmosphere to reach the Earth, and is therefore less intense. Time of day. Daily changes in the angle of the sun influence the amount of UV radiation that passes through the atmosphere. When the sun is low in the sky, its rays must travel a greater distance through the atmosphere and may be scattered and absorbed by water vapour and other atmospheric components.
The greatest amount of UV reaches the Earth around midday when the sun is at its highest point. The air is thinner and cleaner on a mountaintop - more UV reaches there than at lower elevations.
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Cloud cover. Clouds can have a marked impact on the amount of UV radiation that reaches the Earth's surface; generally, thick clouds block more UV than thin cloud cover.
Rainy conditions reduce the amount of UV transmission. Air pollution.
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Much as clouds shield the Earth's surface from UV radiation, urban smog can reduce the amount of UV radiation reaching the Earth. Land Cover.
Incoming UV radiation is reflected from most surfaces. Snow reflects up to 85 per cent, dry sand and concrete can reflect up to 12 per cent.
Resource depletion - Wikipedia
Water reflects only five per cent. Reflected UV can damage people, plants, and animals just as direct UV does. You will not receive a reply. Skip to main content Skip to "About government". Effects on the skin Although fair-skinned, fair-haired individuals are at highest risk for skin cancer, the risk for all skin types increases with exposure to UV -B radiation.
And above all, natural resource depletion is defined on the premise that the value of a resource is measured in terms of its availability in nature. A resource that is rare on earth due to depletion has a higher value than a natural resource which is in abundance. Due to the increasing global population, the levels of natural resource degradation is also increasing.
Herein is a detailed explanation of the causes, effects, and solutions of natural resource depletion. The total global population is more than seven billion people. Still, there is a consistent increase in the overall earth populace and this has been a critical factor in accelerating the depletion of natural resources.
An increase in populace expands the need for resources and conditions necessary to sustain it.
Resource Depletion and Overuse
In addition, it contributes to increased ecological contamination. Research further indicates that developing countries are using more and more resources to industrialize and support their ever-increasing population. Hence, the depletion of natural resources will continue as long as the world population increases. Humans are causing a lot of stress to land resources due to the over-reliance on food production for daily nutritional requirements. Poor irrigation practices, for example, is a key contributing factor to salinization and alkalization of the soil that sustains plants growth.
Poor soil management practices and the use of heavy machinery and farming equipment also destroy the soil structure making it unsuitable for plant growth. Some farming practices such as excessive use of pesticides, fungicides, and herbicides equally kill important soil micro-organisms that are essential in replenishing nutrients in the soil.
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- Depletion Of Forests Essay!
The World Bank reported that the net loss of global forest between and was 1. On the same note, tropical deforestation is estimated to occur at a rate of one percent annually, especially in Latin America regions. People are clearing forests primarily for agricultural reasons due to the increase in the population pressure. Humans are also cutting down trees to make space for residential complexes and multiplexes. Through deforestation , the planet not only loses tress but also thousands of animals and great plant biodiversity due to the destruction of their natural habitats.
Moreover, increased logging activities lead to soil erosion that degrades natural soil minerals. The industrial revolution saw large-scale mineral and oil exploration and the practice has been gradually growing, leading to more and more natural oil and mineral depletion. And together with the advancements in technology, development and research in the contemporary era; exploitation of minerals has become easier and humans are digging deeper to access different ore. The increased exploitation of different minerals has led to some of them entering into a production decline.
For example, minerals such as Gasoline, Copper, and Zinc production are estimated to decline in the next 20 years. Plus, oil mining continue to rise due to the upsurge in the number of engines that use petroleum thereby magnifying its depletion. The peak oil theory supports this fact by putting forward that it will come a time when the globe will experience uncertainties on alternative means of fuels owing to the over-harvesting of petroleum. An increase in population and modern anthropogenic activities is a major contributor to the disposal of pollutants into the natural environment and as such, the value of natural environments are gradually exposed to degradation.
The soil, air, lakes, and seas are being contaminated with sewage, radioactive, materials, and toxic chemicals among other pollutants. Uncontrolled release of carbon monoxide, nitrous oxide, sulfur oxide, and carbon dioxide, for example, have resulted in the degradation of the ozone layer and global warming — environmental changes with their resultant depletive impacts on different natural habitats. Millions of different animal and plant species have thus lost their natural habitats and are on the verge of extinction.
The present-day world is incessantly becoming industrialized as more and more countries make major technological breakthroughs.