Food Prices Driven Up by Global Warming, Study Shows | Common Dreams

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Food Prices Driven Up by Global Warming, Study Shows | Common Dreams.

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Global warming has already harmed the world’s food production and has driven up food prices by as much as 20% over recent decades, new research has revealed.

  An Indian farmer displays wheat after harvest on the outskirts of Jammu, India, Thursday, May 5, 2011. Global warming has already harmed the world’s food production and has driven up food prices by as much as 20% over recent decades, new research has revealed. (AP Photo/Channi Anand) The drop in the productivity of crop plants around the world was not caused by changes in rainfall but was because higher temperatures can cause dehydration, prevent pollination and lead to slowed photosynthesis.

Lester Brown, president of the Earth Policy Institute, Washington DC, said the findings indicate a turning point: “Agriculture as it exists today evolved over 11,000 years of reasonably stable climate, but that climate system is no more.” Adaptation is difficult because our knowledge of the future is not strong enough to drive new investments, he said, “so we just keep going, hoping for the best.”

“It is vital,” said Wolfram Schlenker, at Columbia University in New York and one of the research team. “If we continue to have the same seed varieties and temperatures continue to rise, then food prices will rise further. [Addressing] that is the big question.”

“We actually have enough calories to feed the world quite comfortably, the problem is meat is really inefficient,” as many kilogrammes of grain are needed to produce one kilogramme of meat, he said. “As countries get richer and have a preference for meat, which is more expensive, they price people in poorer countries out of the market.”

Global food prices have risen by about 200% in recent years, says Schlenker. Other causes of the rise are the increased demand for meat and the diversion of food into biofuels. Nonetheless, the researchers conclude that the negative impact on crops overall is “likely to be incurring large economic and health costs”.

How Climate Change Became A “Liberal Hoax”: Big Business vs. Science

Photograph of Noam Chomsky

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The sixth video in the series “Peak Oil and a Changing Climate” from The Nation and On The Earth Productions.

Linguist, philosopher and political activist Noam Chomsky talks about the Chamber of Commerce, the American Petroleum Institute and other business lobbies enthusiastically carrying out campaigns “to try and convince the population that global warming is a liberal hoax.

What does 350 mean?

350 is based on findings that 350 ppm CO2 is the safe limit in the atmosphere for humanity.  This is supported by scientists, climate experts, and progressive national governments.  There is a conclusion, based on accelerating arctic warming and other early climate impacts, that we are already around 392 ppm.  The idea is that if we do not rapidly return to below 350 ppm, that we will reach a point of no return.

Parts per million is simply a way of measuring the concentration of different gases, and means the ratio of the number of carbon dioxide molecules to all of the molecules in the atmosphere.

There are three numbers, they say, that are important to know when it comes to global warming:

275: For all of human history until about 200 years ago we have been at around 275 ppm.  How do we know this?  We arrived at this number from data collected by analyzing ice cores.  Since the 18th century we have been taking MILLIONS of years worth of carbon, stored beneath the Earth in various forms, and releasing it to the atmosphere.

392: After this relatively short period of time, compared to the age of the Earth, we have reached 392 ppm CO2.  This number is rising by 2 ppm every year.  This is higher than any other time in recorded history.  This is taking into account the regular biogeochemical cycles of Earth.  There has been numerous disastrous events related to the amount of CO2 in the atmosphere

Glaciers are melting


The Pasterze, Austria 1875



The Pasterze, Austria 2004



Rhone glacier: Kanton of Valais, Switzerland (The Alps) in 1859



Rhone glacier: Kanton of Valais, Switzerland (The Alps) 2001



Athbasca glacier: Jasper National Park, Canada 1919 and in 2005


Glaciers are the source of drinking water for hundreds of millions of people.  This water is emptying out into the ocean, causing sea levels to rise 6 inches higher than 100 years ago.  This is a danger to any city along a coast.

Mosquito Ranges and Mosquito-borne Diseases

Carrying malaria and dengue fever into new regions which were previously not part of the mosquito’s range.


According to the U.S. Geological Survey there is a current drought in the Western part of North America.  The United Nations estimates that an area of fertile soil the size of Ukraine is lost every year because of drought, deforestation, and climate instability.  There is speculation that the drought in Mekong is a result of climate change.

Ocean acidity

CO2 and its sister chemical species, HCO3 and CO32- comprise the carbonate buffer system which regulates the pH of seawater.  It is becoming more difficult for organisms like corals and clams to build and maintain their shells and skeletons.  Coral reefs could start dissolving at an atmospheric CO2 concentration of 450-500 ppm.

The strongest indicator, says, is the Arctic and the dissapearing sea ice.  Sea ice was somewhere below the summer average of 39% for 1979-2000.


Arctic Sea Ice from 1979-2000


350:  Some of the world’s leading climate scientists have revised the highest safe level of CO2 to be this number in ppm.