18 - 1 Flashcards
Greenhouse gases keep the heat in the atmosphere, which in turn warms up the earth.
different gases from fossil fuels
Different forms of waste
- Physical Waste or Solid Waste
- Water waste
- Sewage - mainly feces
- Air polution
chloro fluoro carbons have destroyed the ozone layer.
And then we banned them back in the 1970s. And the ozone layer has been repairing but it’s not fully repaired yet, but it lets more UV light in from the sun. And that can result in different diseases and cancers and plant death.
So the main forms of radiation being
X rays, CAT scans, etc
mercury,
which mostly you can see in a lot of places, but the most common one that you would probably be exposed to is in the fish
lead
where it’s lead based paints or leaking and pipes and it can get into your water
asbestos
which is for insulation and has been we don’t use anymore but in some older buildings, there may be asbestos in some of the insulation and once there’s a crack in the wall, or something breaks or they tear it down, it lets off a lot of asbestos into the air, which can lead to lung cancer.
We recognize that environmental pollutants contribute to chronic disease in addition to infectious disease
Technological advances have had a negative impact on the health of the planet and human health
How Many People Can the World Hold?
Suggested that the Earth’s carrying capacity has been exceeded
changes will be required in Food, Available land and water, Energy, & Minimum acceptable standard of living
Factors That Contribute to Population Growth
Fertility rates
—Developed countries have reductions in fertility due to contraception while undeveloped countries have fertility rates sustaining population growth
—Families have enough children to work for the household and care for parents in old age
Lack of family planning resources
—More than half of the world’s population do not use any form of family planning
Lower death rates
—Higher rates in developing countries but have decreased due public health measures and improved medical care
Population management must change the condition of people’s lives
—Remove the pressure to have large families
The air quality health index (AQHI) is used to determine potential health risk
Calculated on the risks of the mixture of:
Nitrogen Dioxide (NO2)
Particulate matter
Ground level ozone (O3)
The higher the AQHI the greater the associated health danger
+7 or above is considered high
Smog was first used in London in the early 1900’s to describe smoke and fog
Today smog is a mixture of pollutants with ground level ozone being the key ingredient
ex. Heavy motor vehicle traffic, high heat and sunny weather
Greenhouse Effect and Climate Change (1)
Temperature of the earth depends on the balance of energy absorbed and radiated back to space
Key components of temperature regulation are:
Carbon dioxide
Water vapour
Methane
Other greenhouse gases
Greenhouse gases are so named as they act like panes of glass in a greenhouse
Traps some of the infrared radiation and re-radiate it back to earth
Needed to keep the Earth more hospitable for all life forms
Step 1 of Greenhouse Effect
Energy from the sun warms Earth.
Most incoming solar radiation is
absorbed by the atmosphere and
Earth’s surface; the rest gets
reflected back into space
Step 2 of Greenhouse Effect
Earth radiates heat away as infrared
energy. Some of this energy is radiated
into space, some is absorbed by the
atmosphere, and some is reradiated
back to Earth’s surface by greenhouse
gases in the atmosphere. This reradiated energy also warms Earth.
Step 3 of Greenhouse Effect
Human activity is increasing the
concentration of greenhouse gases in
the atmosphere. The concentration of
these gases helps determine how much infrared radiation gets reflected back to Earth, so an increase in these gases can cause Earth‘s temperature to rise.
There is consensus that human activity is causing global warming or climate change
Climate change –
long term shift in weather conditions
Global warming
an increase in the Earth’s atmospheric temperature
Serious weather events of Climate Change
More frequent flooding
Extreme heat
Extreme cold weather events
Combustion of fossil fuels
Levels of CO2 have increased dramatically in recent decades
Ice core samples suggest CO2 is 40% higher than in the last 800,000 years
Deforestation sends CO2 into the atmosphere and destroys the trees that covert CO2 into O2
Canada ranks in the top three countries to emit more than double the global average of greenhouse gases