global warming and agriculture

Discussion in 'Environment' started by Old Rocks, Mar 26, 2009.

  1. Old Rocks
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    Old Rocks Diamond Member

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    Monday, February 9, 2009
    *****Catastrophic Fall in 2009 Global Food Production*****
    by Eric deCarbonnel




    Market Skeptics: *****Catastrophic Fall in 2009 Global Food Production*****
    Monday, February 9, 2009
    *****Catastrophic Fall in 2009 Global Food Production*****
    by Eric deCarbonnel


    After reading about the droughts in two major agricultural countries, China and Argentina, I decided to research the extent other food producing nations were also experiencing droughts. This project ended up taking a lot longer than I thought. 2009 looks to be a humanitarian disaster around much of the world


    This is precisely what the scientists have been warning us about.
     
  2. Old Rocks
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    Old Rocks Diamond Member

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    MONTREAL, Canada, Mar 10 (IPS) - Some of the first species impacted by increasingly acidic oceans have been identified just as scientists meet in Copenhagen this week to present new data showing that climate change is far more urgent and serious than current economic problems.

    One affected species, foraminifera, a sand grain-sized plankton, is responsible for the sequestration of 25 to 50 percent of the carbon the oceans absorb and thus plays a major role in keeping atmospheric carbon dioxide (CO2) concentrations at much lower levels than they would be otherwise. Now scientists have learned that foraminifera (forams) shells are much thinner in oceans made more acidic by the enormous volumes of CO2 released in the burning of fossil fuels.


    CLIMATE CHANGE: Acid Oceans Altering Marine Life

    It was only a few years ago that researchers realised that human emissions of CO2 were making the surface waters of oceans more acidic. That prompted a rush of new research to determine what the impacts might be. It turns out that forams, other shell forming species like mussels, as well as corals and fish are casualties in humanity's giant, uncontrolled experiment that involves injecting huge quantities of CO2 into the atmosphere.

    And we cannot look to the ocean to make up for food losses on land
     
  3. FactFinder
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    FactFinder VIP Member

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    Little Discussed Facts About The Benefits of Global Warming

    Have the climate scientists ever wondered if Global Warming could make life on earth better? Most of today’s climate studies are concentrated on the negative effects of global warming.

    A recent study by Spiegel explores the window of positive aspects of global warming. He quotes in his article that there is a higher possibility of global warming making life on earth better to all species. The worst case scenarios that global warming may lead to, mentioned by various climate scientists are based on extrapolating data, which was collected inaccurately in the earlier half of this century.

    Following are some keypoints which will prove that global warming will make Northern hemisphere greener:

    How important is CO2 for vegetation?

    The result of 20 year long study by five scientists discloses the fact that the vegetation in Northern Hemisphere has increased 8 to 12 percent across North America and Eurasia. This proves that at the continental scale, atmospheric CO2, temperature, and precipitation account for 49%, 31%, and 13% of the increase in growing season LAI [Leaf Area Index], respectively.

    What are the benefits of increased CO2 concentration?

    Elevated concentration of CO2 enhances aerial fertilization effect, that will work wonders on plants that utilize all three of the major bio chemical pathways of photosynthesis (C3 [typical photosynthesis], C4 and CAM [C4 and CAM are photosynthesis adopted to arid conditions]).

    The productivity of herbaceous plants can be boosted about a third in response to a 300ppm increase in the air’s CO2 content. On the contrary, woody plants will show an increase in growth of 50%.

    How Tropical Forests are affected by global warming?

    An almost 20 year long study conducted by NASA scientists under Kazuhito Ichii on tropical forests in Africa, Asia, and the Amazon revealed that the recent changes in atmospheric CO2 and climate promoted terrestrial GPP [gross primary productivity] increases with a significant linear trend.

    What are the effects of global warming on Agriculture?

    Agricultural experts says that optimum temperature is actually warmer than it is today. According to them an increase in atmospheric carbon dioxide would benefit global plant life.

    Is global warming’s benefits restricted to plant life?

    Nopes, It is not. Global warming will result in fewer weather related premature human deaths. And hence will reduce human mortality rates pertaining to warmer temperatures.

    Global Warming presents us with a bunch of opportunities and challenges. We should aim at converting these opportunities in our favour so that it can fight against the challenges. Instead of getting worried about the drastic ill effects of global warming let us all strive to capitalize the benefits of global warming so that it is no longer a threat for existence of life on planet earth.

    Too bad we are now cooling
     
    Last edited: Mar 27, 2009
  4. FactFinder
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    Coral Reefs Set For Rapid Growth


    13 December 2004
    Coral Reefs Set For Rapid Growth
    by Kate Melville

    In a research paper appearing in the journal Geophysical Research Letters, Aussie scientists say that coral reefs around the world could expand in size by up to a third in response to increased ocean warming and the greenhouse effect. "Our finding stands in stark contrast to previous predictions that coral reef growth will suffer large, potentially catastrophic, decreases in the future. Our analysis suggests that ocean warming will foster considerably faster future rates of coral reef growth that will eventually exceed pre-industrial rates by as much as 35 per cent by 2100," says oceanographer Ben McNeil, from the University of News South Wales.

    Coral reefs are built from calcium carbonate when red algae cement together a framework of coral skeletons and sediments. Seawater surface temperatures and the quantity of carbonate in seawater dictate their growth rate. Previous research has predicted a decline of between 20 and 60 percent in the size of coral reefs by 2100 relative to pre-industrial levels due to increasing CO2 levels in ocean surface waters. The new research suggests that present coral reef calcification rates are not in decline and are equivalent to late 19th century levels.

    The Australian scientists have observed the calcification-temperature relationship at significant reef-building colonies around the world in the Indo-Pacific and at massive Porites reef colonies in Australia, Hawaii, Thailand, the Persian Gulf and New Ireland. The predicted increase in the rate of coral reef calcification is most likely due to an enhancement in coral metabolism and/or increases in photosynthetic rates of red algae, according to the scientists. "Our results show that increases in coral reef calcification associated with ocean warming outweigh decreases associated with increased atmospheric CO2", says co-researcher Richard Matear. "While initially showing a decrease in calcification up to 1964, ocean warming outweighs the CO2 effect and stimulates recovery of coral reef calcification."

    This study was done in 2004 so we have not seen the benefits due to the ocena cooling since 2003. The good news os that after the ocean cools acidity goes down
     
    Last edited: Mar 27, 2009
  5. FactFinder
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    Baltimore Weather Examiner: Oceans are cooling according to NASA

    Two separate studies through NASA confirm that since 2003, the world's oceans have been losing heat. In the peak of the recent warming trend, 1998 actually ranked 2nd to 1934 as the warmest year on record.
     
    Last edited: Mar 27, 2009
  6. strollingbones
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    water will be a problem...look at ca...the food basket blah blah blah well not without water..and the water is beginning to run out...look at drought maps you may be shocked..western nc has been in a moderate to extreme drought for a couple of years now..the feds took water rights away from people out west..kalamath i believe was the name ....water will quickly become a hot button topic...in the south..states are beginning to sue one another over water...following what has been going on in the west for decades..the fight over water rights.
     
  7. Midnight Marauder
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    Water.... Yes....

    It takes 1,500 gallons of water to make one gallon of ethanol out of corn. So let's burn our food, waste our water, so we can use this fuel, which is "green" ONLY if you consider its slightly reduced CO2 output, but which when combusted produces 100 times as much of the definitely poisonous, definite pollutant CO (Carbon Monoxide) which is toxic to every living thing on the planet.
     
  8. editec
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    editec Mr. Forgot-it-All

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    Rapid changes in environmental conditions may in the long run have positive outcomes. Who knows?

    The trick will be to surive the transition as our society must adapt to the changing conditions.
     
  9. Old Rocks
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    Old Rocks Diamond Member

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    Most certainly did not. That study was for the US, 2% of the worlds surface. The rest of the world was not that warm in 1934. In fact, 1998 and 2005, depending on which study you choose, are emphatically the warmest years on record for the world.

    And the oceans are not cooling, they are warming;
    Oceans Warming Faster : Discovery News : Discovery Channel




    Oceans Warming Faster Than Realized
    Marlowe Hood,




    Heating Up June 18, 2008 -- The world's oceans have warmed 50 percent faster over the last 40 years than previously thought due to climate change, Australian and U.S. climate researchers reported Wednesday.

    Higher ocean temperatures expand the volume of water, contributing to a rise in sea levels that is submerging small island nations and threatening to wreak havoc in low-lying, densely-populated delta regions around the globe.

    The study, published in the British journal Nature, adds to a growing scientific chorus of warnings about the pace and consequences rising oceans.
     
  10. Old Rocks
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    Old Rocks Diamond Member

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    Why don't you ask the people in Australia, California, Texas, or the Red River Valley about the benefits of global warming and the resultant climate change.
     

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