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Cbc feature Of billion people in the world, billion are obese and billion are starving
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tarix | 28.07.2018 | ölçüsü | 2,29 Mb. | | #59380 |
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CBC feature CBC feature Redistribution is needed!!
Water acts to moderate Earth’s Temperature Water acts to moderate Earth’s Temperature Heat req’d to melt snow and evaporate liq. High heat capacity: 1cal/gram/oC Unique in that solid is less dense than liquid at 4oC: (ice floats!)
Moderates the planet
Record snowfalls of 2008 Winter are expected to produce a 1 foot rise in the average water level in the Great lakes Record snowfalls of 2008 Winter are expected to produce a 1 foot rise in the average water level in the Great lakes In a year, 25% of the problem from the last 15 years is corrected 1” of rain ~ 1 foot of snow
Some lost by sublimation
Only net water gain to Great Lakes if source of snow is not “the lake effect” Only net water gain to Great Lakes if source of snow is not “the lake effect” El Nina in Pacific is good : cools NA and moisture evaporates from Ocean- net gain in water levels for NA
1969 River fire in Cleveland
PM Trudeau and Pres. Nixon, alarmed by 1969 fire on Cuyahoga River, sign on PM Trudeau and Pres. Nixon, alarmed by 1969 fire on Cuyahoga River, sign on
US /Canada agree to “restore and maintain the chemical, physical and biological integrity of the waters of the Great Lakes Ecosystem” US /Canada agree to “restore and maintain the chemical, physical and biological integrity of the waters of the Great Lakes Ecosystem” Commit to rid GL’s of “persistent toxic substances”-ie those that linger and potentially poison food sources
Started in 1981-still going Started in 1981-still going 1987: emphasis placed on importance of human and aquatic ecosystem health 43 “areas of concern”
Report commissioned by the IJC (oversees issues of GL management) Report commissioned by the IJC (oversees issues of GL management) 25 “areas of concern” Outbreaks of Minimata disease: includes Cerebral Palsy due to Hg poisoning in Thunder Bay, Collingwood, Sarnia, Cornwall
Chlor-Alkali Plants: use Hg in making Cl2 and NaOH. Started in 1894 Chlor-Alkali Plants: use Hg in making Cl2 and NaOH. Started in 1894 4 cities had large plants (1949-95). 742 tons released Electrolysis of salt water: (Hg) used as an electrode 2Cl- oxidized (LEO) to Cl2. OH- from reduction (GER) of water . H2 also formed.
2H2O------------------>>H2 + 2OH- 2H2O------------------>>H2 + 2OH- 2Cl- ------------------------>> Cl2 (g) H+ ion in water gains electrons GER Chlorine and OH- produced Na+ is spectator ion (no change)
New tech is available, but not Ohio, Wisc. New tech is available, but not Ohio, Wisc.
Health Canada knew in 1990’s Health Canada knew in 1990’s No public report-leaked in 2000 “there is a reluctance in both US and Canada to admit that there are ANY effects of pollutants on fish, wildlife and human health”
Food for blue-green algae (cyanobacteria) : summer 2007 Food for blue-green algae (cyanobacteria) : summer 2007 Fertilizers, detergents enter natural waters
What are your views on What are your views on (i) the best Energy sources (and why) (ii) solution to pollution
Some necessary steps Population control: reduce/stabilize overall E and food demands Nuclear power: Clean-low level radioactive waste buried deep in the ground (its origin); no C emissions. Oil has max 100 years left. Make clean technology financially attractive (gov’t initiatives/grants)
Refuses to acknowledge the reality of nuclear power as the future Refuses to acknowledge the reality of nuclear power as the future France (highest ~60% nuclear) has cleanest air in Europe Wind/solar/wave/biomass etc.OK for off grid applications, but not practical for constant large urban needs
Ont Gov’t plans new nuclear power facility Alberta considers nuclear power option despite “tar sands” resources 1 barrel of oil used to produce 2 barrels in Tar sand project (CBC feature March 2008) Huge CO2 emitter. Nuclear is the solution
Alberta tar sands: world’s largest oil resource outside Saudi Arabia Alberta tar sands: world’s largest oil resource outside Saudi Arabia BUT..requires a lot of Energy to extract it (~ 1 barrel of oil to produce 2 ) AND-massive environmental destruction
Deforestation Deforestation Tailing ponds
Most dangerous contaminant is naphthenic acid (PNAH with carboxylic acid bonded to it) Most dangerous contaminant is naphthenic acid (PNAH with carboxylic acid bonded to it) Process of extraction involves using vast quantities of hot water, naptha and paraffin in order to separate the sparingly soluble butumen from the tar sands
Each cubic meter of bitumen extracted produces 3-5 X the volume of aqueous “tailings” that must be stored Each cubic meter of bitumen extracted produces 3-5 X the volume of aqueous “tailings” that must be stored Area the size of Lake Ontario needed!-visible with naked eye from outer space Also alkyl substituted PAH’s (carcinogenic) in these ponds
Fort Chipewan (1st nations ; downstream form tarsands projects) Fort Chipewan (1st nations ; downstream form tarsands projects) Greater incidence of cancer, lupus and MS since tarsands development started
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