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James Linzel

Experts be damned: World population will continue to rise | Science/AAAS | News - 0 views

news.sciencemag.org/...-population-will-continue-rise

experts world population rise science

shared by James Linzel on 21 Sep 14 - No Cached
  • there’s a 95% chance the world population will be between 9 billion and 13.2 billion by the year 2100,
Erin Rossing

For the Birds: Environmental Effects on Population | SMILE - 0 views

howtosmile.org/3658

applied learning environmental population math lessons

shared by Erin Rossing on 16 Feb 14 - No Cached
  • Erin Rossing on 16 Feb 14
     
    Great math and science activities, many related to sustainability and environment
James Linzel

IPCC finally weighs in on how to avoid further climate change | Ars Technica - 0 views

arstechnica.com/...o-avoid-further-climate-change

shared by James Linzel on 15 Apr 14 - No Cached
  • growth is accelerating.
  • from 1970-2000 was about 0.4 billion tons more each year
  • three-quarters of these emissions come from fossil fuels
  • ...9 more annotations...
  • rest come from things like deforestation, livestock production, and industrial pollutants.
  • much is due to economic growth and the rising use of coal in places like China.
  • population growth
  • Combining all anthropogenic climate forcings—including greenhouse gases, land use changes, and sunlight-reflecting aerosol particles—gives a net result equal to a CO2 concentration of around 430 parts-per-million
  • it must come back down to 450 parts-per-million by the end of the century
  • it’s clear that low-carbon options like renewables, nuclear energy, and fossil fuels with carbon capture will need to account for more than three-quarters of all electrical generation by 2050 if we’re going to meet that two degree Celsius target
  • Despite strong urban growth in many places, energy use in buildings could level off or decrease by the middle of this century if the right choices are made in terms of efficiency
  • long-lasting infrastructure we put in place now can determine, to a large degree, how much energy residents of a city will need to use
  • And while we’ve made some progress on deforestation, there’s potential there as well—forests and agricultural lands could be pulling CO2 out of the atmosphere, rather than releasing more, by the end of the century
Jason Dillon

Bees and Colony Collapse - NYTimes.com - 0 views

www.nytimes.com/...bees-and-colony-collapse.html

bees ecology farming

shared by Jason Dillon on 15 Jul 14 - No Cached
  • real issue, though, is not the volume of problems, but the interactions among them. Here we find a core lesson from the bees that we ignore at our peril: the concept of synergy, where one plus one equals three, or four, or more.
  • the most sophisticated data set available for any species about synergies among pesticides, and between pesticides and disease. The only human equivalent is research into pharmaceutical interactions, with many prescription drugs showing harmful or fatal side effects when used together, particularly in patients who already are disease-compromised.
  • We discovered that crop yields, and thus profits, are maximized if considerable acreages of cropland are left uncultivated to support wild pollinators. Continue reading the main story 98 Comments Continue reading the main story Recent Comments Clyde Wynant 26 minutes ago There is no precedent in the short history of mankind for the toxic soup of chemical we all ingest from birth to death, in our food supply,... Carolyn Egeli 37 minutes ago Thank you for this thoughtful piece on the demise of the honeybees. The clear message is we have a problem the increasing use of pesticides... phyllis 58 minutes ago Bzzzzzzzzz! A very good reminder of the dying huge numbers of honeybee colonies and the also the plants they pollinate . We must always... See All Comments Write a comment A variety of wild plants means a healthier, more diverse bee population, which will then move to the planted fields next door in larger and more active numbers.
  • ...4 more annotations...
  • Honeybee collapse has been particularly vexing because there is no one cause, but rather a thousand little cuts.
  • farmers who planted their entire field would earn about $27,000 in profit per farm, whereas those who left a third unplanted for bees to nest and forage in would earn $65,000 on a farm of similar size.
  • lesson in the decline of bees about how to respond to the most fundamental challenges facing contemporary human societies.
  • Mark Winston, a biologist and the director of the Center for Dialogue at Simon Fraser University, is the author of the forthcoming book “Bee Time: Lessons From the Hive.”
Tom Musk

Issues and Trends in China's Demographic History | Asia for Educators | Columbia Univer... - 0 views

afe.easia.columbia.edu/...china_1950_population.htm

demographics population asian history

shared by Tom Musk on 15 Dec 14 - No Cached
  • Tom Musk on 15 Dec 14
     
    Overview of the demographic trends in China. Great for the course.
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