Global Warming
The future of corn on a hot planet
Crop scientists have been pushing up corn yields for decades. But the newer strains just can't stand the heat
A troubling fact about corn: In the United States from 1940-1960, after the introduction of hybrid corn and in the wake of the disastrous Dust Bowl years of 1934 and 1936, corn yields and corn heat tolerance both grew. But since 1960, while yields have continued to grow as new hybrid and genetically modified varieties have been introduced, along with other agricultural innovations, heat tolerance has actually fallen.
Why is this significant? Because after a certain temperature, usually around 86 degrees Fahrenheit, corn yields drop dramatically. And even the most conservative mainstream climate scientist predictions about the effect of global warming include temperature rises that would hammer the corn-growing heartland of the United States.
These insights come from a fascinating new paper, “The Evolution of Heat Tolerance of Corn: Implications for Climate Change” by North Carolina State University’s Michael J. Roberts, a professor of Agricultural and Resource Economics, and Wolfram Schlenker, an economist at Columbia University. The researchers take advantage of a 100 years of incredibly detailed information on corn yields and temperature records in Indiana, the third-largest corn-growing state in the U.S.
Since the mildest scenario for climate change would result in heat extremes “worse than the worst of the Dust Bowl years” the question of corn heat tolerance is critical for the future of the American corn belt. Perhaps most alarming:
The… decline in heat tolerance might be due to the fact that maximizing corn plants for average yields also makes them more sensitive to suboptimal growing conditions…”
Which leads to the question “whether recent increases in yields could only be achieved by making plants less heat resistant, or whether future breeding cycles can increase both heat tolerance and average yields at the same time.”
Monsanto, I am sure, would answer the latter part of that question with a resounding affirmative. But the alternative is chilling: We have been progressively breeding and engineering crop strains that are less and less able to cope with climate change.
Roberts and Schlenker conclude with an interesting point about crop prices and income inequality, and a slight dig at Michael Pollan. Pollan has argued for years that subsidizing corn production has led to artificially low prices for corn products and thus contributed to undesirable things such as the obesity crisis. In that scenario, higher prices for corn would be better for our health.
But Roberts And Schlenker point out that such would only be true in a world without vast disparities in income. Rich people, or rich countries like the United States, shrug off rising grain prices and continue to merrily go about their carnivorous corn-fed-meat-eating ways. But poor people in poorer countries can’t handle even minor price increases, and starve.
If incomes were not so divergent, prices would simply rise until enough people substituted to a presumably more healthy diet with less meat. The main reason climate change impacts on agriculture pose such a great threat lies not just in the size of potential production impacts, but also because massive income inequality limits potential adaptation on the demand side of the market. The greatest hope is an uncertain one: that technological change will obviate the need for behavioral change.
Andrew Leonard is a staff writer at Salon. On Twitter, @koxinga21. More Andrew Leonard.
Republican climate folly
As temperatures break records, the GOP holds firm: The less we know about global warming, the better
Frank Gehrke, chief of snow surveys for the Department of Water Resources, stands in a snow-free meadow at Echo Summit, Calif. Warm spring weather, combined with lower then normal precipitation, caused the statewide snowpack water content to be only 40 percent of normal for this time of year. (Credit: AP/Rich Pedroncelli) Whatever adjective you choose — ironic? tragic? ludicrous? — the outcome of a series of budget votes held in the GOP-controlled House on Tuesday was definitely interesting. The chamber was wrangling over a series of amendments to an appropriations bill for the Departments of Commerce and Justice. The battle line was drawn between senior Republicans trying to resist further spending cuts, and young Turks looking to slash and burn.
In every case but one, the senior Republicans (with the help of Democrats) proved victorious. The lone exception? An amendment proposed by Maryland’s Andy Harris, cutting $542,000 in funding for a climate website at the National Oceanic and Atmospheric Administration.
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Andrew Leonard is a staff writer at Salon. On Twitter, @koxinga21. More Andrew Leonard.
Global warming hits home
After a year of freakish and destructive weather, Americans are finally waking up to the dangers of climate change
Houses were severely damaged after Hurricane Irene came through Bethel, Vt. on August 28, 2011 (Credit: U. S. Fish and Wildlife Service - Northeast Region / CC BY 2.0) The Williams River was so languid and lovely last Saturday morning that it was almost impossible to imagine the violence with which it must have been running on August 28, 2011. And yet the evidence was all around: sand piled high on its banks, trees still scattered as if by a giant’s fist, and most obvious of all, a utilitarian temporary bridge where for 140 years a graceful covered bridge had spanned the water.
The YouTube video of that bridge crashing into the raging river was Vermont’s iconic image from its worst disaster in memory, the record flooding that followed Hurricane Irene’s rampage through the state in August 2011. It claimed dozens of lives, as it cut more than a billion-dollar swath of destruction across the eastern United States.
Continue Reading CloseBill McKibben is the Schumann Distinguished Scholar at Middlebury College, and founder of the global climate campaign 350.org. His latest book is "Eaarth: Making a Life on a Tough New Planet.". More Bill McKibben.
Every country for itself
As American power wanes, we're being faced with a dangerous new power vacuum. An expert explains what's next
For the first time in nearly a century, the world doesn’t have a clear set of leaders. A generation ago, the G-7 – France, Germany, Italy, Japan, United Kingdom, United States and Canada – not only powered the global economy, they also, for better or worse, made the decisions that determined the outcome of the entire world. But over the last several years, the dynamic has changed.
According to a widely discussed 2010 report by London’s Standard Chartered Bank, the world has entered a new “‘super-cycle” in which traditional economic hierarchies are being upended. Ever since the financial crisis, the U.S. has lost the economic strength and force of will to be the world’s policeman. The number of Americans, for example, who believe the U.S. should “mind its own business internationally” has spiked to a level unseen since the 1950s. Meanwhile, new powers, like China, India and Brazil, have been unwilling to fill the power vacuum the U.S. has left behind. One could argue that this is a nice change from America’s aggressive past interventionism, but it has also helped create the global stalemate on everything from global warming to humanitarianism in Syria. And it’s a fact that has the potential to radically affect our future, both in positive and negative ways.
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Thomas Rogers is Salon's Arts Editor. More Thomas Rogers.
The Maldives’ ousted president on climate change and tyranny
Ousted in a February coup, Mohamed Nasheed talks global warming, Islamic radicals and "The Island President"
Mohamed Nasheed in "The Island President" It would be too optimistic to claim that the 2009 Copenhagen Summit represented a breakthrough or turning point in the battle against climate change. But it was the first moment when the United States, China and India — the world’s biggest polluters — all agreed in principle to reduce carbon emissions, and as symbolic statements go, that one was pretty big. Copenhagen also catapulted a most unlikely head of state to pop-star status, at least within the worldwide environmental movement. Mohamed Nasheed, who was then the president of the Maldives — Asia’s smallest country, both in area and population — emerged as the developing world’s most charismatic and dynamic spokesman on the causes, and the costs, of global warming.
Continue Reading CloseThe ugly delusions of the educated conservative
Better-educated Republicans are more likely to doubt global warming and believe Obama's a Muslim. Here's why
(Credit: AP Photo/Ross D. Franklin) I can still remember when I first realized how naïve I was in thinking—hoping—that laying out the “facts” would suffice to change politicized minds, and especially Republican ones. It was a typically wonkish, liberal revelation: One based on statistics and data. Only this time, the data were showing, rather awkwardly, that people ignore data and evidence—and often, knowledge and education only make the problem worse.
Someone had sent me a 2008 Pew report documenting the intense partisan divide in the U.S. over the reality of global warming.. It’s a divide that, maddeningly for scientists, has shown a paradoxical tendency to widen even as the basic facts about global warming have become more firmly established.
Chris Mooney is the author of four books, including "The Republican War on Science" (2005). His next book, "The Republican Brain: The Science of Why They Deny Science—and Reality," is due out in April. More Chris Mooney.
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