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Global Warming Menaces California Wine Industry
Mon 16 August, 2004 23:19

By Maggie Fox, Health and Science Correspondent

WASHINGTON (Reuters) - California will become hotter and drier by the
end of the century, menacing the valuable wine and dairy industries,
even if dramatic steps are taken to curb global warming, researchers
said on Monday.

The first study to specifically forecast the impact of global warming
on a U.S. state also shows the snowpack melting in the Sierra Nevada
mountains, more frequent heat waves hitting Los Angles and disruptions
to crop irrigation.

Researchers from the Carnegie Institution's Department of Global
Ecology in Stanford, the Union of Concerned Scientists, the National
Center for Atmospheric Research and elsewhere ran scenarios through
new computer models of global warming.

All predicted California's weather would be hotter and drier, but this
would be worse if only weak action is taken to reduce emissions of
carbon dioxide and other greenhouse gases contributing to warming the
planet.

"We are already in a situation where we have seen some warming and we
have seen some impacts," said Carnegie's Christopher Field, who led
the study.

"If we stay on higher emissions trajectory, there will be consequences
over the coming decades that are truly, truly serious and something I
think reasonable people would be doing whatever they could to avoid,"
he said in a telephone interview.

Writing in the Proceedings of the National Academy of Sciences, Field
and colleagues described the impact based on scenarios devised by the
Intergovernmental Panel on Climate Change.

One forecast, the so-called high emissions trajectory, is what Field
described as business as usual. "High economic growth, high
globalization and a strong emphasis on fossil fuels," he said.

The low-emissions trajectory has slightly lower economic growth with
industries shifted from factories toward service industries and
information technology.

QUADRUPLED EMISSIONS

Under the highest-emissions forecast, carbon emissions by the end of
the century will be 28 billion tons of carbon per year -- about four
times the current rate of 6 billion to 7 billion tons a year. The
low-emission scenario forecasts the emissions would stay at the
current level.

"By the end of the century under the (best) scenario, heat waves and
extreme heat in Los Angeles quadruple in frequency while heat-related
mortality increases two to three times; alpine/subalpine forests are
reduced by 50 percent to 75 percent and Sierra snowpack is reduced 30
percent to 70 percent," Field and his colleagues wrote.

Under the worst scenario, heat waves in Los Angeles are six to eight
times more frequent, with up to seven times as many heat-related
deaths as now. The Sierra snowpack falls by 90 percent.

This could "fundamentally disrupt California's water rights system,"
the researchers wrote.

They estimated that the $3.8 billion a year dairy industry and the
$3.2 billion dollar grape industry would be especially vulnerable.

California, which has taken stronger action than other states to
reduce emissions, for example with strict requirements for vehicles,
cannot save itself, Field said.

"California has something like 2 percent of the world's total global
greenhouse emissions," he noted.

"Even if California were to aggressively adopt emissions controls,
global climate wouldn't respond to that directly. But if California is
proactive, that could inspire the rest of the U.S. to be proactive,
which could inspire the rest of the world, and you would see a domino
effect."