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More people More Problems

THIS IS DONE DO NOT TOUCH UNTIL WE SHOW RAGU!!!
by

Dharmesh Patel

on 9 May 2010

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Transcript of More people More Problems

Population Rise

The current population in the world
is ESTIMATED to be 6,814,400,000.
Now that is alot for our world.The
amout of people in the world is rising
by the minute causing more poverty, pollution
and death!
Impact of humans

The world’s human population has passed 6 billion and continues to increase. The growth in the human population and the increase in the standard of living are putting strains on the global environment. Here are some of the ways in which this is happening:

* non-renewable energy resources, such as coal, oil and natural gas, are being used up rapidly
* raw materials are being used up rapidly
* more waste is being produced
* more pollution is being caused Waste

A mountain of household and industrial rubbish

Pollution is the addition of substances to the environment that may be harmful to living organisms. Population growth and increases in the standard of living cause more waste to be produced. If this waste is not handled correctly, it leads to pollution. The most obvious form of pollution is often simply just litter on the ground, but pollution can affect the air and water too. Land pollution

Most rubbish is buried in landfill sites and not all of it comprises safe materials. Even common household items can contain toxic chemicals such as poisonous metals. Many smoke alarms contain radioactive americium. Industrial waste is also discharged onto the land. Many farmers apply pesticides to improve their crops, but these can damage living things. Toxic chemicals can be washed from the land into rivers, lakes and seas. Water pollution

Spilled crude oil causes a lot of harm to the environment, both sea and land
Water pollution is caused by the discharge of harmful substances into rivers, lakes and seas.
Many aquatic invertebrate animals cannot survive in polluted water, so their presence or absence indicates the extent to which a body of water is polluted. Air pollution

Factories can cause air pollution

The most common source of air pollution is the combustion of fossil fuels. This usually happens in vehicle engines and power stations. Deforestation

Humans have been cutting down trees for thousands of years. We do this to clear land for farming and building, and for wood to use as a fuel or building material.

Forestry is sustainable as long as forests are allowed to replace themselves, or are replanted after felling, but often this is not done. The result is that the world’s forests are steadily shrinking. More People More Problems! Human Impact Raw Materials What Are Raw Materials?

well raw materials are things that
we have to get from the earth to make useful things.
Some of the examples are: Coal or Crude Oil. These arse all NON-RENEWABLE
sources of fuel. They damage the environment alot as they give out Carbon Dioxide.
Coal

Coal is a black solid fossil fuel. It is usually very hard. Coal is made of 65%-95% carbon. It is formed from fossilised peat, the remains of plants that lived millions of years ago in tropical wetlands. Uses

Coal can be burned for energy or heat. About two-thirds of the coal mined today is burned in power stations to make electricity. Burning it is not as common as it used to be, because it causes much pollution. Coal can be dry-distilled (heated in high temperature in a place where there is no oxygen) to produce coke. Coke is even better fuel than coal, and coke can be used in smelting for reducing metals from ores. Crude Oil

Crude Oil is sometimes also known as
Petroleum. It is a thick black liquid .It is mainly
found in the Middle East,
North America, and Russia. It is the most
important world energy source.
It supplies 38% of the world's energy at present.
Uses

Petroleum can be easily transported by pipeline. Treated petroleum can be used as fuels; mainly gasoline (petrol) for cars, Diesel fuel for Diesel engines used in trucks, trains and ships, kerosene fuel for jets and as lubricants.

Problems


Petroleum resource is limited and non-renewable. Most of it would run out within 70 years. Burning petroleum gives out carbon dioxide. Carbon dioxide is oxygen that was already brought to the lungs of people. It can only be renewed by plants. Many environmentalists worry about the damage being done by using oil as a fuel source (especially global warming) and are therefore happy that prices are kept high so that people use less oil.


Population

Population growth is the change in a population over time.
Experts say that by the end of the century the population of the world could
have exceeded 10 Billion!...That, in a number, is, 10,000,000,000! That is a
monstrous amount of people in a world only 12,753 km (7,926 miles) long in diameter.
This means that the population density will be massive. Population Density

The population density of a country or city is a way of showing how crowded that place is. It is calculated by dividing the population by the area. Some places, such as cities, have very high population densities, so they are quite crowded. The population density of New York City is 10,292 persons per square kilometre. Other places, such as large countries, can have very low population densities. The population density of Canada is only 3.5 persons per square kilometre. The country with the highest population density in the world is Monaco, with 16,620 persons per square kilometre. The country with the lowest is Greenland, which has only 0.03 persons per square kilometre.
Population Growth

Population growth is the change in a population over time. Currently we have
population explosion. this means that more people arse coming into this world and more and more old people are staying alive! This is due to new medicines and treatments. THANK YOU FOR WATCHING!!
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