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Global warming or arctic freeze?

David Montgomery and Richard Sadler

GLOBAL warming, rather than making the weather milder and wetter, could
plunge Britain into a mini ice-age "within a few decades", according to new
scientific evidence.

Research using ice cores in Greenland suggests that climate change in Britain
and north-west Europe could happen far more quickly than in other parts of
the world - and that the British climate could start changing rapidly.

Contrary to the generally accepted notion that Britain will gradually become
warmer as the planet heats up, the results of the study suggest that
temperatures are more likely to plunge into an arctic freeze.

In the worst-case scenario, the North Sea will freeze over during the winter
and icebergs will drift as far south as Portugal - the kind of conditions
experienced during the last big freeze 12,700 years ago.

The western Highlands will be covered by an ice cap similar to the one
covering Iceland, glaciers will appear in the Lakes District, Wales and the
Pennines and the rest of England will be covered by permafrost.

The findings, announced yesterday at the British Association Festival of
Science in London by Professor John Lowe, of London University, open up the
prospect of potentially catastrophic climate change within a human lifetime.

Prof Lowe, the leader of a multinational team of scientists studying past
climate changes just returning from Greenland, described the latest evidence
as "startling".

"The danger for the UK and parts of north-west Europe is that there’s an
assumption that the climate is somehow going to get warmer as the world warms
up," he said.

"But some of these models suggest that north-west Europe will experience a
rapidly alternating climate and my personal opinion is that there’s going to
be a period of great instability which will be difficult for insurance
companies and governments to respond to."

Evidence gathered by Prof Lowe’s team from past climate patterns suggests
that after a "false dawn" of warmer weather across the world, the massive
Greenland ice sheet will melt, the polar ice front will move south-eastwards
and Britain will be plunged into freezing conditions.

The researchers extracted cores of ice from the Greenland ice sheet to a
depth of 3,000 metres. Each contained perfectly-preserved layers of frozen
ice representing snow falls from the past 1,500-2,000 years.

These give vital information about the nature of past climate variations
which Prof Lowe’s team has matched with data from seabed sediments.

"It wasn’t until the publication of the first ice core records in the early
1990s that we began to realise just how quickly things could change," said
Prof Lowe, a geologist at London University.

"Now we’re making progress in the way we can pin this down - for the first
time, we can get a better handle on the way the world has operated during
previous climatic changes.

"I don’t believe that within ten years we’re going to be wiped out or that
we’ll all be in dire straits, but I do think that in 30 to 40 years we’re
going to see a big difference.

"You only need a small change of a degree or so to have a serious effect and
obviously there is the potential for major disruption to agriculture and the
economy."

It is not clear why northern Europe should cool down, while the rest of the
world heats up, but an important factor is thought to be the effect of ice
melting from the Greenland ice sheet and other ice sheets in Iceland and
Norway.

The movement of billions of tonnes of melted fresh water on the surface of
the north-east Atlantic could contribute to a sudden drop in temperatures.

This in turn could abruptly bring a halt to the Gulf Stream, the warm water
from the Caribbean which has kept the British climate relatively warm for the
past 10,000 years.

The government’s Natural Environment Research Council will shortly announce
an initiative to study the ice core data so future climate change can be
predicted more accurately.




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