THE PROGRESSIVE CONSERVATIVE, USA

An Online Journal of Political Commentary & Analysis
Volume XII, Issue # 45, March 15, 2010
Dr. Almon Leroy Way, Jr., Editor
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CLIMATE WARMING CREATED FARMING
By Dennis T. Avery

THE EARTH'S NATURAL HISTORY & HUMAN ECONOMIC DEVELOPMENT:   THE RELATIONSHIP BETWEEN CLIMATE CHANGE & AGRICULTURE -- HOW GLOBAL WARMING CREATED FARMING -- WHAT THE ICE CORES TELL US ABOUT THE INVENTION OF FARMING -- FOOD PRODUCTION BEFORE & AFTER THE END OF THE LAST GREAT ICE AGE -- THE IMPACT OF HIGHER CARBON DIOXIDE LEVELS ON AGRICULTURE -- THE VERY LIMITED SUPPLY OF LOGIC AMONG CONTERPORARY ENVIRONMENTALISTS & GLOBAL WARMING ALARMISTS
FULL STORY:   A new study by Dr. Shahal Abbo of Israel says the invention of farming wasn’t due to climate change, because farming depends on a relatively stable climate. Dr. Abbo isn’t looking at the picture broadly enough.

The ice cores tell us the invention of farming came about not long after the end of the last Great Ice Age, one of the earth’s key climate changes. Modern Homo Sapiens had been around for over 100,000 years — but we’ve found no evidence of farming until after the last big ice sheets melted about 10,700 years ago.

Before then, humans had been stealing birds’ eggs, digging clams, gathering seeds, and picking berries. Stone Age man also learned that his hunting bands could drive big carnivores away from their kills with stone-tipped spears, then feasting on meat they couldn’t catch themselves.

Wondrously, the ice disappeared. The earth’s climate warmed more than 10 degrees Celsius. Chicago, for example, shifted from mile-thick glacier to sunny Corn Belt. That’s certainly climate change in my book. And, since the big ice sheets have been gone, the earth’s climate has indeed been relatively stable.

Mostly, the temperatures, over the last ten millennia, have ranged up and down about 2-4 degrees Celsius at the latitude of Paris or Washington. The major variations have been the moderate 1,500-year Dansgaard-Oeschger climate cycles documented in the ice layers and seabed sediments. Our Modern Warming is apparently the sixth such warming cycle in 10,000 years. The warmest of the recent warming cycles began 9,000 years ago, and was 2.5 degrees warmer than today.

Humans probably continued their traditional hunting and gathering in the first years after the ice receded. But in the Middle East of 9,000 years ago, the Stone Age hunters apparently began to notice recurring seasonal crops of wild cereals. At first, they probably gathered some of the grain to eat, and perhaps some more to lure sheep near enough for killing.

But, as human numbers expanded under the basking sun, there may not always have been enough wild game in the Judean hills to feed everybody. The idea of deliberately planting more of the cereal seeds, domesticating livestock and shifting their diets more heavily to grain would gradually have become attractive. And humans of 10,000 years ago were fully as intelligent, curious, and anxious to survive as we are today.

Once the idea of controlling food production ignited, the rest is history. Farmers have taken over every part of the world that can readily grow crops, and even some difficult eco-systems that are right on the margin, such as Asia’s terraced mountainside rice paddies.

Many global warming alarmists have warned that today’s “unprecedented warming” would bring poorer crop yields. However, a Chinese research team reported recently in Climate Research that China’s food production has increased during the Modern Warming. Credit for the food production gains goes both to the longer, warmer growing seasons — and to the fertilization effect of higher carbon dioxide levels have on crop plants. Higher CO2 levels both stimulate crop growth and increase the plants’ water use efficiency.

Chinese rice and wheat production have expanded north with the 1.1 degree warming of the past 50 years, displacing lower-yield short-season crops. In addition, the extended growing seasons have permitted higher cropping intensities: three crops in two years for many areas where, before, there was only annual cropping.

Logic should have told us to expect this increased food production — but logic has been in short supply among the environmentalists and global warming alarmists.

RESOURCES:
Shahal Abbo, et al., 2010, “Yield Stability: An Agronomic Perspective on the Origin of Near East Agriculture,” Vegetation History and Archeobotany 19: 143-150.

W. Dansgaard et al., 1989, “The abrupt termination of the Younger Dryas climate event,” Nature 339, 532-534.

Dong, et al., 2009, Effect of Post-1980 Warming on Cropping Systems in China,” Climate Research 40: 37-48.


LINKS TO RELATED TOPICS:
Agriculture, the Economy, & Human Health & Welfare:
Policy Issues Relating to Food Production & Consumption

The Earth's Natural History, Global Climate Changes,
& the Future of Human Life & Civilization on the Planet:
Science, Ideology, & Public Policy

Political Environmentalism Versus Human Progress & Prosperity:
Policy Issues Relating to Energy, Environment,
& Natural Resources



Dennis T. Avery is a senior fellow for the Hudson Institute in Washington, D.C. He is an environmental economist and was formerly a senior analyst for the U.S. Department of State. He is co-author, with S. Fred Singer, of Unstoppable Global Warming Every 1500 Hundred Years. Readers may write him at PO Box 202, Churchville, Virginia, 24421 or send email to cgfi@hughes.net




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