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Lecture 3

Lecture 3 Study Guide

9 Pages
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Department
Environmental Science
Course Code
EESA10H3
Professor
Jovan Stefanovic

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Human Health and the Environment
Lecture 3: Waterborne Hazards and Human Health
Announcements
There have been numerous questions regarding the dates for the midterm and final exam.
These dates have yet to be finalized by the registrars office. The professor has requested
that we have the gym for one room to write in. If this is the case, the midterm examination
will take place the week after the reading week. This is just preliminary information as we
do not know a day or time. As soon as the date for the midterm is finalized it will be posted
on the intranet. The video for lecture one will be posted tomorrow for us to watch.
Remember late submissions of assignments will not be accepted period.
Assignment 1
Read through the assignment carefully in detail. Ask the TA questions. Give your idea and
ask if it is correct. You can ask basically anything you want. After that, if you still do not
know what to do, you are not clear, you want to learn more, professor is available from 4PM
to 6PM to answer questions regarding the assignment. Go to TA first for the TA is fully
responsible for the assignments. The assignment is to be done single-spaced. Question 3 is a
maximum of two pages including the references. It could be shorter than two pages. The
major idea is important. Find scientific papers published in scientific journals to support
your opinion or get more information regarding the question. You can use other books and
internet resources to elaborate if you like. Make sure you are getting reliable information
from the web. Try to be original and do not be repetitive.
Question 1: Discuss environmental risks to your health. Explain: this is the risk; I have that
risk that will affect my health, what will happen to me, are you going to potentially
experience some lung damage or is it cancerous say why and how you know that. Did you
learn that in lecture, read it in a book, is it from the internet, how do you know that risk is
associated with that health affect. Make sure that you explain. What type of risks or
hazards? The hazards include chemical, physical, social, biological, cultural or
environmental hazards. Is this a season of flu? Do you take TTC, drink tap water, smoke,
drink, and/or drive a car (indoor environment) many different risks. Do you eat breakfast,
does your roommate smoke. Can we have an overlapping of the risks? It could be but try not
to do it because if you have idea for five you do not have to repeat it.
Question 2: An explanation is needed. If you start right away you can get help from TA.
Liquid natural capitol
Water generally is a liquid capitol, natural capitol
Why is it natural? Water is available everywhere in nature, we are surrounded by water
Even our body is mostly consisted of water
Earth is a water planet 71% of our surface is covered with water
Not all of this water is available for us for our consumption
Why? Mostly salty water we are surrounded by huge oceans and huge seas
Life Support EESA10H3 S
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Not much fresh water that we can use for human consumption and animal consumption
Why is water so important? No living species (animals, plants, or humans) can survive
and live without water
We always think about drinking though water is not just for drinking
Everything in household from cleaning to cooking, industrial purposes, agriculture (for
watering plants and crops)
There is a science called geomorphology that discusses sculpting the Earths surface
Water is one of the factors that changes the shape of planet Earth this is called water
erosion
One of the types of erosion is water soil erosion - changes, moving of the soil by water
water streams, surface runoff
Moderating climate mild winter, hot summers (not that hot)
Water is a universal solvent solve many different chemicals, same is the thing in
nature
Water is involved in dissolving and diluting particles can be good and something that
we might not want
Water also dilutes wastes and pollutants what happens is move water together with
water stream/flow and reach rivers, lakes, ponds, oceans
How much fresh water is available?
Not much fresh water is available on Earth
97.4% of all water is found in oceans and saline lakes
2.6% in fresh water is available
Of the 2.6% in fresh water most of it is captured as ice caps and glaciers (1.984%)
Water from ice caps and glaciers is not readily available (might be if global warming
continues)
Groundwater composes of a significant amount of the fresh water
Groundwater is available for us but we need to pump it out to use it and consume it and
also not use it more than it is replenished
There is only 0.014% of readily available fresh water
Of this, 0.007% is found in lakes, 0.005% as soil moisture, some significant amount of
water is in atmosphere as water vapour and some as biota (all living organisms)
There are huge amounts of water stored in leaves and vegetation
How do we use the worlds fresh water?
There is a comparison between three countries Canada, U.S. and China
There is a significant difference in the use of fresh water between these three countries
We are most interested in Canada 64% of the fresh water is used for power plant
cooling, 15% in industry, 12% in public and 9% in agriculture
If you look at the graph of the U.S. much more water is used in the agricultural sector
(41%)
United States uses much more water for irrigation in agriculture; China uses even
much more (61%)
www.notesolution.com
More specifically how do we use water in households? Too much water is used for
conventional use flushing toilet (30%), showering (35%), laundry (20%), drinking 10%
and cleaning (5%)
Hydrological poverty
Canada has plentiful water available but what about the people in some areas of the
world
People in many developing countries just dont have enough water for basic things such
as drinking or cooking
One out of six people do not have regular access to clean water (safe water to drink)
In many areas such as North Africa and Western Asia people travel far distances to just
get a couple of litres of water (they spend half of the day doing it)
They need to do it just to survive (often use polluted water because that is all they can
find)
As a result of this diarrheal deaths is very common in developing countries
It is the number one cause of death in children younger than five years old
The biggest risk 2 million kids die every year due to diarrheal death
Adults are also under high risk but definitely children are at a huge risk
Water and Your health
We are in desperate need for help drinking water and swimming water
Drinking Water
It is our right to know what it is that we drink what other chemicals that we have in a
glass of water that we consume today
Our municipals must provide us with record they are checking our tap water everyday
Provide us with annual reports on local drinking water quality
On water bottles it says naturally pure water water cannot be 100% pure because
water naturally has to have some minerals
We need calcium, potassium, magnesium, sodium and salts
There is no such thing as naturally pure water
Distillate water is water without salts our body needs salts
Our tap water comes from Lake Ontario, an example of surface water
Surface water in urban areas mostly from rivers, lakes and reservoirs
Ground water can also be used for water supply wells are very common in rural areas
Ground water reservoirs can be very small or extremely huge
There is one ground water reservoir in the U.S. thousands of metres deep underground
that runs in 6 states
If we withdraw all this water more than can be naturally replenished that water
reservoir will shrink and it will not last forever
How is drinking water treated?
What do the municipalities do after they take water from rivers, lakes and reservoirs?
They need to clean it, it is not for drinking
Life Support EESA10H3 S
www.notesolution.com

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Description
Human Health and the Environment Lecture 3: Waterborne Hazards and Human Health Announcements There have been numerous questions regarding the dates for the midterm and final exam. These dates have yet to be finalized by the registrars office. The professor has requested that we have the gym for one room to write in. If this is the case, the midterm examination will take place the week after the reading week. This is just preliminary information as we do not know a day or time. As soon as the date for the midterm is finalized it will be posted on the intranet. The video for lecture one will be posted tomorrow for us to watch. Remember late submissions of assignments will not be accepted period. Assignment 1 Read through the assignment carefully in detail. Ask the TA questions. Give your idea and ask if it is correct. You can ask basically anything you want. After that, if you still do not know what to do, you are not clear, you want to learn more, professor is available from 4PM to 6PM to answer questions regarding the assignment. Go to TA first for the TA is fully responsible for the assignments. The assignment is to be done single-spaced. Question 3 is a maximum of two pages including the references. It could be shorter than two pages. The major idea is important. Find scientific papers published in scientific journals to support your opinion or get more information regarding the question. You can use other books and internet resources to elaborate if you like. Make sure you are getting reliable information from the web. Try to be original and do not be repetitive. Question 1: Discuss environmental risks to your health. Explain: this is the risk; I have that risk that will affect my health, what will happen to me, are you going to potentially experience some lung damage or is it cancerous say why and how you know that. Did you learn that in lecture, read it in a book, is it from the internet, how do you know that risk is associated with that health affect. Make sure that you explain. What type of risks or hazards? The hazards include chemical, physical, social, biological, cultural or environmental hazards. Is this a season of flu? Do you take TTC, drink tap water, smoke, drink, andor drive a car (indoor environment) many different risks. Do you eat breakfast, does your roommate smoke. Can we have an overlapping of the risks? It could be but try not to do it because if you have idea for five you do not have to repeat it. Question 2: An explanation is needed. If you start right away you can get help from TA. Liquid natural capitol Water generally is a liquid capitol, natural capitol Why is it natural? Water is available everywhere in nature, we are surrounded by water Even our body is mostly consisted of water Earth is a water planet 71% of our surface is covered with water Not all of this water is available for us for our consumption Why? Mostly salty water we are surrounded by huge oceans and huge seas Life Support EESA10H3 S www.notesolution.com
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