is often defined as the application of scientific principles to the human life.
are mishaps that occur because the very complexity of modern technologies ensures they will
though in unpredictable ways. fail,
is a social system in which technology distributes danger and advantage among all social groups, although some are more exposed than others are.
1. Heat-trapping gases produced mainly by human activity collect in the atmosphere (CO
[carbon dioxide], CH
2. More heat enters the atmosphere than escapes because some of it is absorbed and some of it is reflected back by the blanket of heat-trapping gases.
3. Heat melts ice, creating water and revealing tundra.
4. Tundra releases CH
, a more effective heat-trapping gas than CO
5. Water reflects less heat than ice does because it’s darker than ice, speeding up global warming.
Heat-trapping gases (C0
(1) gases from burning fossil fuels, etc., released into atmosphere
Annual Mean Global Surface Air
Temperature and Atmospheric Carbon
Dioxide Concentration, 1880-2009
Safe upper limit: 350 ppm
Note: Pre-1959 carbon dioxide concentration estimates come from intermittent Antarctic ice core measurements. Post-1958 carbon dioxide concentration estimates are based on continuous atmospheric measurements from the Mauna Loa Observatory in
BIG VERSION http://svs.gsfc.nasa.gov/vis/a000000/a004000/a004030/2012_GISSTEMP_ update_datescolorbarcentered.mp4
SMALL VERSION http://svs.gsfc.nasa.gov/vis/a000000/a004000/a004030/2012GISStemp_d atescolorbarcentered.m4v
The high level of CO
2 in the atmosphere is partly absorbed by the oceans, causing them to acidify (lowering pH due to the formation of carbonic acid) faster than at any point in the past 300 million years.
56 million years ago, ocean pH fell by .01
unit per century.
Now, ocean pH is falling by .1 unit per century.
Coral reefs, oysters, salmon, and other species are threatened by ocean acidification.
Worldwide Insured Losses Due to
“Natural” and Human Catastrophes,
1970-2009 (in 2005 $US billions)
Oil: 22% Gas: 13%
284 billion tons used by 2011
These calculations exclude heat-trapping gases others than carbon dioxide, such as methane.
Environmental issues become social problems when…
policy-oriented scientists, the environmental movement, the mass media, and respected organizations discover and promote the issues;
people connect real-life events to the information learned from these groups; and
scientists, industrial interests, and politicians who dispute the existence of environmental threats must fail to convince the public that the threat is illusory and human intervention is unnecessary.
Environmental racism is the tendency to heap environmental dangers on the disadvantaged.
Total particulate matter, short tons per capita
20 40 60
Aboriginals as percent of population
250 km. downstream along the Athabasca
River from the industrial centre of the Alberta tar sands
Going for a walk in Tiananmen
Square, Beijing, 21 January 2013
Sixteen of the world’s 20 most polluted cities are in China. Air quality in Beijing deteriorated beyond World Health
Organization (WHO) safe limits every day in January 2013. Official measurements of fine airborne particulates
(PM2.5) that pose the largest health risks rose to 993 micrograms per cubic meter in Beijing on 12 January 2013, compared with WHO guidelines of no more than 25 micrograms per cubic meter.
CAD $2,804.25 + tax (20 Feb 2013)
Top Carbon Dioxide Emitters, 2011
Percent of global CO
Share of world population (B) emissions (A)
Index of irresponsibility
Why the market and high technology can’t solve the problems of environmental degradation on their own:
Price signals are imperfect.
Political pressure is needed.
The pace of change is too slow.
Renewable Resources, World,
Percent Decrease, 1990-2010
Percent decrease fish catch irrigable land crop land rangeland, pasture forests
Reduce consumption of just about everything by people in rich countries.
Increase investment in energy-saving technologies and environmental cleanup.
Subsidize environmentally friendly industrialization in developing countries.
Renew commitment to voluntary efforts, new laws and enforcement bodies to ensure compliance.
Carefully assess risks associated with biotechnology projects and consult public before such projects go forward.
Share profits from genetic engineering with donors of genetic material.
Awareness of the gravity of the environmental problem
Belief in the capacity of people and their governments to solve the problem
Willingness to make substantial economic sacrifices to get the job done.
Recycles paper, glass
Regularly lowers home temp
Uses low-flow shower head
Does not drive to work