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Fred Pearce - With Speed and Violence: Why Scientists Fear Tipping Points in Climate Change

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Fred Pearce With Speed and Violence: Why Scientists Fear Tipping Points in Climate Change
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Fred Pearce has been writing about climate change for eighteen years, and the more he learns, the worse things look. Where once scientists were concerned about gradual climate change, now more and more of them fear we will soon be dealing with abrupt change resulting from triggering hidden tipping points. Even President Bushs top climate modeler, Jim Hansen, warned in 2005 that we are on the precipice of climate system tipping points beyond which there is no redemption.As Pearce began working on this book, normally cautious scientists beat a path to his door to tell him about their fears and their latest findings. With Speed and Violence tells the stories of these scientists and their workfrom the implications of melting permafrost in Siberia and the huge river systems of meltwater beneath the icecaps of Greenland and Antarctica to the effects of the ocean conveyor and a rare molecule that runs virtually the entire cleanup system for the planet. Above all, the scientists told him what theyre now learning about the speed and violence of past natural climate change-and what it portends for our future. With Speed and Violence is the most up-to-date and readable book yet about the growing evidence for global warming and the large climatic effects it may unleash.

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WITH SPEED AND VIOLENCE WITH SPEED AND VIOLENCE Why Scientists Fear Tipping - photo 1
WITH SPEED AND VIOLENCE
WITH SPEED AND VIOLENCE
Why Scientists Fear Tipping Points
in Climate Change

FRED PEARCE

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We are on the precipice of climate system tipping points beyond which there is no redemption.

JAMES HANSEN, director, NASA Goddard Institute for Space Studies, New York, December 2005

CONTENTS

xi

xv

xix

xxiii

I WELCOME TO THE ANTHROPOCENE

........ 3

..... 18

....... 21

II. FAULT LINES IN THE ICE

............. 35

.... 46

................. 49

................ 55

iii. RIDING THE CARBON CYCLE

............ 63

... 68

........ 71

.......... 86

iv. REFLECTING ON WARMING

.................... 105

.... 115

.......... 120

V. ICE AGES AND SOLAR PULSES

....................... 127

............. 148

............... 155

VI. TROPICAL HEAT

.................. 167

................ 175

........... 185

........ 188

.......... 194

VII. AT THE MILLENNIUM

. 201

............. 204

..... 210

...................... 217

VIII. INEVITABLE SURPRISES

..... 225

.............. 229

CHRONOLOGY OF CLIMATE CHANGE

5 billion years ago Birth of planet Earth

600 million years ago Last occurrence of "Snowball Earth," followed by warm era

400 million years ago Start of long-term cooling

65 million years ago Short-term climate conflagration after meteorite hit

55 million years ago Methane "megafart" from ocean depths causes another short-term conflagration

50 million years ago Cooling continues as greenhouse-gas levels in air start to diminish

25 million years ago First modern ice sheet starts to form on Antarctica

3 million years ago First ice-sheet formation in the Arctic ushers in era of regular ice ages

100,000 years ago Start of most recent ice age

16,000 years ago Most recent ice age begins stuttering retreat

14,500 years ago Sudden warming causes sea levels to rise 65 feet in 400 years

12,800 years ago Last great "cold snap" of the ice age, known as the Younger Dryas era, is triggered by emptying glacial lake in North America and continues for around 1,300 years before ending very abruptly

8,200 years ago Abrupt and mysterious return to ice-age conditions for several hundred years, followed by warm and stable Holocene era

8,000 years ago Storegga landslip in North Sea, probably triggered by methane clathrate releases that also bolster the warm era

5,500 years ago Sudden aridification of the Sahara

4,200 years ago Another bout of aridification, concentrated in the Middle East, causes widespread collapse of civilizations

1,200 to 900 years ago Medieval warm period in the Northern Hemisphere; megadroughts in North America

100 to 150 years ago Little ice age in the Northern Hemisphere, peaking in the 169os

1896 Svante Arrhenius calculates how rising carbon dioxide levels will raise global temperatures

1938 Guy Callendar provides first evidence of rising carbon dioxide levels in the atmosphere, but findings ignored

1958 Charles Keeling begins continuous monitoring program that reveals rapidly rising carbon dioxide levels in the atmosphere

1910s Beginning of strong global warming that has persisted ever since, almost certainly attributable to fast-rising carbon dioxide emissions, accompanied by shift in state of key climate oscillations such as El Nino and the Arctic Oscillation, and increased melting of the Greenland ice sheet

Early 1980s Shocking discovery of Antarctic ozone hole brings new fears of human influence on global atmosphere

1988 Global warming becomes a front-page issue after Jim Hansen's presentations in Washington, D.C., during U.S. heat wave

1992 Governments of the world attending Earth Summit promise to prevent "dangerous climate change" but fail to act decisively

1998 Warmest year on record, and probably for thousands of years, accompanied by strong El Nino and exceptionally "wild weather," especially in the tropics; major carbon releases from burning peat swamps in Borneo

2001 Government of Tuvalu, in the South Pacific, signs deal for New Zealand to take refugees as its islands disappear beneath rising sea levels

2003 European heat wave-later described as the first extremeweather event attributable to man-made global warming-kills more than 30,000; a third of the world is reported as being at risk of drought: twice as much as in the 1970s

2005 Evidence of potential "positive feedbacks" accumulates with exceptional hurricane season in the Atlantic, reports of melting Siberian permafrost, possible slowing of ocean conveyor, escalating loss of Arctic sea ice, and faster glacial flow on Greenland

THE CAST

Richard Alley, Penn State University, Pennsylvania. A glaciologist and leading analyst of Greenland ice cores, Alley is one of the most articulate interpreters of climate science. He has revealed that huge global climate changes have occurred over less than a decade in the past.

Svante Arrhenius, a Swedish chemist. In the 189os, he was the first to calculate the likely climatic impact of rising concentrations of carbon dioxide in the atmosphere, and thus invented the notion of "global warming." Modern supercomputers have barely improved on his original calculation.

Gerard Bond, formerly of Lamont-Doherty Earth Observatory, Columbia University, New York. A geologist, Bond was one of the first analysts of deep-sea cores; until his death, in 2005, he was an advocate of the case that regular pulses in solar activity drive cycles of climate change on Earth, such as the little ice age and the medieval warm period.

Wally Broecker, Lamont-Doherty Earth Observatory, Columbia University. An oceanographer and one of the most influential and controversial U.S. climate scientists for half a century, Broecker discovered the ocean conveyor, a thousand-year global circulation system that begins off Greenland and ends in the Gulf Stream, which keeps Europe warm.

Peter Cox, UK Centre for Hydrology and Ecology, Wareham. Cox is an innovative young climate modeler of aerosols' likely role in keeping the planet cool-and of the risks that land plants will turn from a "sink" for to a "source" of carbon dioxide later in this century.

James Croll, a nineteenth-century Scottish artisan and self-taught academic. After many years of study, he uncovered the astronomical causes of the ice ages, a discovery that was later attributed to the Serbian mathematician Milutin Milankovitch.

Paul Crutzen, Max Planck Institute for Chemistry, Mainz, Germany. An atmospheric chemist who won the Nobel Prize in 1995 for his work predicting the destruction of the ozone layer, Crutzen pioneered thinking about stratospheric chemistry, the role of man-made aerosols in shading the planet, and "nuclear winter," and coined the term "Anthropocene."

Joe Farman, formerly of the British Antarctic Survey, Cambridge. Farman's dogged collection of seemingly useless data was rewarded by discovery of the ozone hole over Antarctica.

Jim Hansen, director of NASA's Goddard Institute for Space Studies, New York. Hansen's unimpeachable scientific credentials have preserved his position as President George W. Bush's top climate modeler (as this book goes to press), despite his outspoken warnings that the world is close to dangerous climate change, which have clearly irked the Bush administration.

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