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Lecture 4

Bio 350 Lecture 4.docx

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Department
Biology
Course
BIOL 350
Professor
Lonnie William Aarssen
Semester
Fall

Description
Bio 350 Lecture 4 - Too many people wanting too much leads to food shortage - We are just a species, a product of evolution  Resources, sink, input and outputs that define our system  2 problems: lose recycling or sources? then we can get full sink and empty source (affordability wise, quantity wise) More Problems of input (resources) 5) Food??? (Was 3 before: S) - We’ve been great at finding more food, that’s why our population is growing exponentially BT the supply is worrisome and the price is rising - Seed stock for over 90% of all varities available in 1903 for many food crops have been abaondones- genetic diversity lost forever Main reasons - Drought from climate change - Lost irrigation water from melting/dried up glaciers and depleted aquifers - Rising oil prices - Arable land is at its peak - More land being used to grow bio-fuels instead of crops - Increasing soil degradation  In the last decade, China and India increasing standard of living but consequences on food use and demand has been dramatic! As std of living increases, more people want to eat meat which is expensive to produce o Need to grow a lot of grain to feed these animals o 2.6 for pound of chicken, 6.5 pounds of feed for one pound pork... etc see chart  Seed stock for over 90% of the varieties available in 1903 for many food crops have been abandoned genetic diversity lost forever o Food base we’ve depended on since the start of agriculture has involved variety of species belonging to several food crops in varying parts of the word o Food crop items, 100s of varieties that were held at seed storage laboratory but our industrial model says we don’t need a model, just need SUPER producers including GMOs. We’ve lost genetic diversity!!! Wiped out because we didn’t have the foresight to keep it bc we were excited that we could grow super monocultures of one variety o Will be a problem later  Reaction to that: researchers trying to collect seeds nd  Fish landings increased by 5-fold over the 2 half of the last century o We are losing fish cultures  Marine fish stocks are now fully exploited or decimated worldwide!  Atlantic cod off of Newfoundland is now virtually completely wiped out  Problem is always starting around the 1950s when the pop of the planet tripled from 2 to 6 billion! Now we’re at 7 o Annihilated by the 1990s o Now we’re trying—grand banks cod stock grows 69% increase (BUT IT WAS SO LOW BEFORE!!!) Only 10% now of what it was in the 1960s but at least we have the right attitude  Undernourishment in the world o Growing more food feeds the hungry-for now-but it also creates more mouths that need feeding o Problem therefore doesn't go away 6) Energy  82% of the worlds energy consumption comes from fossil fuels which are a non-renewable resource  uh oh, the middle east has the oil, NA, Asia and Europe has the coal and Russia has the gas (but so does the middle east)  BUT oil and natural gas are the ‘prize’ fuels because of energy density o We might create a situation where western world wants the oil from the middle east  Hydrogen has the MOST energy density so brilliant minds are working on the technologies to fix the problem  The US consumes about 25% of the world’s energy but has only about 5% of the world’s pop o Unequal distribution of energy relative to world population o Ratio of energy consumption per unit population- Canada is up there  World oil consumption more than doubled in the 40 years between 1965-2005 o The massive growht in comsuption of oil,doubling in 40 years. Falls and plateaus due to recessions  But in the same time period, oil consumption increased over 7 times in Asia Pacific and 26 X 3000% in China  But missed slide...politics affects it something something o All oil fields peak o When the light sweet crude on top of the grid?girdle? runs out, increased energy and expense are required to extract the underlying heavy, sour crude. At some point, the energy requires to ex
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