Impact Of Human Activities On Environment Essay

Some people believe that the Earth is being harmed (damaged) by human activity. Others feel that human activity makes the Earth a better place to live. What is your opinion? Use specific reasons and examples to support your answer.

We all know that people in the prehistorical period had to struggle natural environment in order to make livings. They had to hunt preys and gather fruits, even cut down trees to build their houses. However, as technology improved, many people are aware of human activities have great influence on our living earth and raise a big debate on this issue. Some people claim that human activities are damage our living earth, simultaneously, the other people advocate that human activity makes the earth a better place to live. In my opinion, I consider that human activities impair our living earth seriously. In the following paragraphs, I will try to detail why I think Earth is being harmed by human activity. [Descent start.Good coordination found]

First of all, our living earth is being harmed by human activity because people overuse natural resource in the present time. As everybody knows, the population on our earth nowadays increases[“has increased”…becuase it is a recent and well known fact.It is not an observation hence “nowdays increase” is wrong to use] rapidly so that more people than before have to consume more food provision and daily commodities. To elaborate the above description, natural resources will become less and less when population continue growing. Frankly speaking, the amount of petroleum decreases quickly because many people drive their own cars which need gasoline. According to the experts’ indication, people who live on the earth today can use gasoline for only thirty years and will sink into energy crisis in the future. [Good finding.Need to be careful about language.See the context first and time.]

Secondly, our living earth is being harmed by human activity because human activity also [repetition] leads to all kinds of[cut this] lethal pollution. As we know, to make more money, many factories and enterprises drain off poisonous waste water into rivers. In addition, air pollution has already damaged the environment of earth and us who also live on the earth. To detail the above argument, the exhaust fume which is emitted by many factories and cars can destroy ozonosphere of the earth and cause greenhouse effect. That is to say, a surfeit of ultraviolet rays will cover the surface of our living earth, not only will human tend to have skin cancer, but many kinds of species living on the earth may encounter extinction. [ok]

Thirdly, our living earth is being harmed by human activity because human activity always destroys the ecological balance of the earth. For example, Jxxxnese [Try not to be political.Instead use “some nations or people”….be neutral. If some Jxxxxxese rate your essay , he can get angry.] are notorious for hunting whales so as to satisfy their voracity. As everybody knows, every species has its own prey.[Line not clear.,] Therefore, if human over hunt some animals or over consume some plants, many species which feed on the above animals or plants will be on the brink of extinction. [Highlight a general point then elaborate through examples.In this para general point can be ” Human activities harm ecosystem. How?? Give your examples to what you have mentioned.]

To sump up, in accordance of the[delete this] above arguments, I can come up with my conclusion [I conclude]that Earth is being damaged by human activity[ies]. Many scholars and environmental groups already spare no effort in announcing the importance of environment protection. In addition, the governments of many countries also make laws to prohibit human activity form wasting natural resources, making all kinds of pollution and destroying ecosystem. Of course, maybe somebody hold different view of this issue. Nevertheless, for the reasons that I have presented above, I think my position is the most valid.

Human Impact on the Environment

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Human Impact on the Environment


Introduction
============

In this project I aim to explain the contributes to the environment by
the actions of humans and display the consequences.

I am going to divide the project into different sections and then sub
sections to make the project easier to navigate around and keep the
information in relevant sections.

· Section 1: HABITAT REDUCTION BY HUMANS.

ü The building of houses and roads

ü Quarrying

ü Farming

ü The draining of wetland areas

ü Recreational uses

· Section 2: POLLUTION.

ü WATER POLLUTION- sewage, fertilisers, chemicals and eutrophication.

ü AIR POLLUTION- Sulphur dioxide from burning fossil fuels leading to
acid rain, carbon dioxide from burning of fossil fuels and methane
from cattle and rice fields leading to greenhouse effect and global
warming.

ü LAND POLLUTION - pesticides, herbicides, and nitrates wash into
rivers and lakes affecting food chains.



Habitat reduction by Humans
===========================

Human beings are dependent on the Earth's diversity of species for our
survival. Wild species play a vital role in the maintenance of the
planets ecological functions, yet everyday on the planet 40-100
species become extinct. Many countries across the world have not got
an endangered species act that is strong enough to protect varying
species from the destruction of humans.

All over the globe humans are determined in building more houses and
roads to supply the growing population of it's residence, making their
lives easier but not sparing a thought to the many habitats, lives and
even species that they will destroy when doing so. A recent local case
has been the building of the BNRR. When building houses and roads
fields, rivers, ponds, and reservoirs get destroyed along with many
animals habitat, leaving them with no where to live and will probably
die.

The whole point of crop farming (monoculture) is to remove a mixed
population of trees, shrubs etc and replace it with a dense population

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of wheat or beans. So maximum crop numbers can be achieved every
attempt is made to destroy threat to the crop such as pigeons and
rabbits, which try to feed on the harvest. The balance between life
and natural plant is upset; the animals are forced to live in small
areas of woodland, hedgerow or heath. There is not enough food to go
around and the stronger survive, many animals will die but some
species may even die out.

When draining wetland areas it destroys the habitat of its inhabitants
such as fish, swans and ducks. They will move to other areas but this
causes that area to become overpopulated and not having enough food
for all, causing them to die out.

Waste disposal is a fast increasing problem as the population is
increasing so is the amount of waste products. Landfill sites take up
space, which would have been used by many different species before it
was used for waste disposal. The rubbish makes the land inhabitable
for animals also dangerous as many animals get injured by glass, sharp
shards of metal, along with others who get trapped in the plastic
rings used to hold beer cans and die.



Pollution
=========

Sewage contains bacteria from human intestine, which can be harmful to
humans and animals. These harmful bacteria must be removed along with
chemicals such as soap and detergent to make them safe enough to be
released into the river. If sewage were released into rivers before
being treated it would no doubt kill any inhabitants in the river.
Some bacteria cause diseases such as typhoid and cholera when they get
inside human intestine. The faeces passed by those suffering of the
disease will contain the harmful bacteria. If these bacteria was
released into rivers and got into drinking water the diseases could be
spread to hundreds of people

Many industrial processes produce poisonous waste products. E.G
Electroplating produces waste containing copper and cyanide, if
release into rivers it would poison animals, plants and even humans
who drink the water.

Eutrophication is when nitrates and phosphates used on farmland and
sewage escape into rivers they causer excessive growth of microscopic
green plants. As the rate of increasing is so rapid the microscopic
animals that feed on them can't keep them in check. This causes them
to die and sink to the bottom of the river or lake. This is where
there bodies are broken down by bacteria which needs oxygen to break
them down which is taken from the water. The water becomes
deoxygenated and can no longer support the animal life, the fish and
other organisms die of suffocation.

It is simplified in the diagram below

[IMAGE][IMAGE]


[IMAGE]

Here is an example of the water surface in eutrophication.

Coal and oil contain sulfur, when these fuels are burned sulfur
dioxide is given off into the air. Although tall chimneys of factories
send sulfur dioxide into the air some of it still dissolves in rain
water and forms an acid, this is what's known as acid rain it can
reduce tree/plant growth and damage leaves, it also slowly dissolves
limestone and mortar on buildings. This form of pollution has been
going on for many years and getting worse, in some places it is
destroying forests and contributing to the death of fish.


Information on how the greenhouse affect effects the earth.The earth's
surface receives and absorbs radiant heat from the sun. As shown in
the diagram below, it re-radiates some of its heat back into space
while the remainder is absorbed and warms the earth. The energy
radiated back from the earth in the form of long wavelength is
absorbed by the earth's atmosphere. The atmosphere acts like the glass
in a greenhouse, it lets in heat and light from the sun but reduces
but reduces the amount of heat that escapes. Not all of the
atmospheric/greenhouse gases are equally effective at absorbing the
infrared radiation oxygen and nitrogen.

The gases, which do absorb the IR radiation, are water vapour, carbon
dioxide, methane and pollutants such as CFC's. These gases are at low
concentrations but if these were to continue increasing the climate
would get warmer. The largest build up of methane gas is over rubbish
tips and cattle/rice fields. most tips have got pipes which collect
the methane gas caused by the breakdown of organic matter such as
vegetables and paper, this gas can be used as fuel. Methane gas
however contributes to the greenhouse effect and as cattle/rice fields
have no method of collecting the natural production of the gas it is
left and contributes to global warming.

Global mean surface temperatures have increased 0.5-1.0°F since the
late 19th century. The 20th century's 10 warmest years all occurred in
the last 15 years of the century. Of these, 1998 was the warmest year
on record. The snow cover in the Northern Hemisphere and floating ice
in the Arctic Ocean has decreased. Globally, sea level has risen 4-8
inches over the past century. Worldwide precipitation over land has
increased by about one percent and especially in the United States
frequency of extreme rainfall events has increased

Graph of Global Temperature Changes 1880 - 2000.Nitrogen oxides


Nitrogen oxides along with sulfur dioxide and carbon monoxide are
produced and released into the atmosphere by cars and a lot of
factories all over the world, a large quantity of this usually in busy
areas such as city's causes the unnatural build up of smog


Although smoke produced by cars etc has been largely eliminated from
our towns/ city's vehicle exhaust gases, contain microscopic particles
coated in hydrocarbons. It is estimated that these hydrocarbons are
the cause of around 10,000 deaths every year, particularly with people
suffering lung diseases such as bronchitis.


Pesticides

Many farmers use chemicals to encourage healthy crop growth, prevent
weed growth and prevent damage by pests and disease. This can effect
the crops by increasing their commercial value but it also can mean
that the crop are less healthy to consumers because traces of the
plant may contain chemicals left in the plant.

Pesticides are chemicals that destroy pest's weeds and diseases, when
these are used the yield (amount produced) of a crop can be
dramatically increased.

Herbicides are chemicals, which can be specific to destroying a
species of plant or part of a plant or just to kill all plants.

When an excess of pesticide/ herbicide is produced then it can badly
disrupt food chains and bioaccumulation occurs. This is when
insecticides are not broken down and become concentrated from one
level in the food chain (Trophic level) to another in fatty deposits
of top carnivores such as birds of prey.

E.g. in the late 1950's sparrow hawk and peregrine populations fell
dramatically due to the introduction of insecticides, this is because
particular insecticides caused shell thinning and circumstantially
break during laying.

Insecticides also took effect on animals living in soils and on the
plants etc.



Conclusion
==========

Personally I fell these are all problems that should be improved on,
but I fell most strongly about global warming. Although precautions
have been taken to prevent this problem worsening, something need to
be done as temperature increases and sea level increase are currently
at a quite alarming rate and are proven to get worse and worse.



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