By Andrew Buncombe
& Severin Carrell
04 October, 2005
polar bear is one of the natural world's most famous predators - the
king of the Arctic wastelands. But, like its vast Arctic home, the polar
bear is under unprecedented threat. Both are disappearing with alarming
Thinning ice and
longer summers are destroying the bears' habitat, and as the ice floes
shrink, the desperate animals are driven by starvation into human settlements
- to be shot. Stranded polar bears are drowning in large numbers as
they try to swim hundreds of miles to find increasingly scarce ice floes.
Local hunters find their corpses floating on seas once coated in a thick
skin of ice.
It is a phenomenon
that frightens the native people that live around the Arctic. Many fear
their children will never know the polar bear. "The ice is moving
further and further north," said Charlie Johnson, 64, an Alaskan
Nupiak from Nome, in the state's far west. "In the Bering Sea the
ice leaves earlier and earlier. On the north slope, the ice is retreating
as far as 300 or 400 miles offshore."
Last year, hunters
found half a dozen bears that had drowned about 200 miles north of Barrow,
on Alaska's northern coast. "It seems they had tried to swim for
shore ... A polar bear might be able to swim 100 miles but not 400."
His alarming testimony,
given at a conference on global warming and native communities held
in the Alaskan capital, Anchorage, last week, is just one story of the
many changes happening across the globe. Climate change threatens the
survival of thousands of species - a threat unparalleled since the last
ice age, which ended some 10,000 years ago.
The vast majority,
scientists will warn this week, are migratory animals - sperm whales,
polar bears, gazelles, garden birds and turtles - whose survival depends
on the intricate web of habitats, food supplies and weather conditions
which, for some species, can stretch for 6,500 miles. Every link of
that chain is slowly but perceptibly altering.
Europe's most senior
ecologists and conservationists are meeting in Aviemore, in the Scottish
Highlands, this week for a conference on the impact of climate change
on migratory species, an event organised by the British government as
part of its presidency of the European Union. It is a well-chosen location.
Aviemore's major winter employer - skiing - is a victim of warmer winters.
Ski slopes in the Cairngorms, which once had snow caps year round on
the highest peaks, have recently been closed down when the winter snow
failed. The snow bunting, ptarmigan and dotterel - some of Scotland's
rarest birds - are also given little chance of survival as their harsh
and marginal winter environments disappear.
A report being presented
this week in Aviemore reveals this is a pattern being repeated around
the world. In the sub-Arctic tundra,caribou are threatened by "multiple
climate change impacts". Deeper snow at higher latitudes makes
it harder for caribou herds to travel. Faster and more regular "freeze-thaw"
cycles make it harder to dig out food under thick crusts of ice-covered
snow. Wetter and warmer winters are cutting calving success, and increasing
insect attacks and disease.
The same holds true
for migratory wading birds such as the red knot and the northern seal.
The endangered spoon-billed sandpiper, too, faces extinction, the report
says. They are of "key concern". It says that species "cannot
shift further north as their climates become warmer. They have nowhere
left to go ... We can see, very clearly, that most migratory species
are drifting towards the poles."
The report, passed
to The Independent on Sunday, and commissioned by the Department for
the Environment, Food and Rural Affairs (Defra), makes gloomy predictions
about the world's animal populations. "The habitats of migratory
species most vulnerable to climate change were found to be tundra, cloud
forest, sea ice and low-lying coastal areas," it states. "Increased
droughts and lowered water tables, particularly in key areas used as
'staging posts' on migration, were also identified as key threats stemming
from climate change."
Some of itsfindings
* Four out of five
migratory birds listed by the UN
face problems ranging from lower water tables to
increased droughts, spreading deserts and shifting
food supplies in their crucial "fuelling stations"
as they migrate.
* One-third of
turtle nesting sites in the Caribbean
- home to diminishing numbers of green, hawksbill
and loggerhead turtles - would be swamped by a sea
level rise of 50cm (20ins). This will "drastically"
hit their numbers. At the same time, shallow waters
used by the endangered Mediterranean monk seal,
dolphins, dugongs and manatees will slowly disappear.
*Whales, salmon, cod, penguins and kittiwakes are
affected by shifts in distribution and abundance of
krill and plankton, which has "declined in places
to a hundredth or thousandth of former numbers
because of warmer sea-surface temperatures."
building, a response to water
shortages and growing demand, is affecting the
natural migration patterns of tucuxi, South
American river dolphins, "with potentially damaging
* Fewer chiffchaffs,
and song thrushes are migrating from the UK due to
warmer winters. Egg-laying is also getting two to
three weeks earlier than 30 years ago, showing a
change in the birds' biological clocks.
The science magazine
Nature predicted last year that up to 37 per cent of terrestrial species
could become extinct by 2050. And the Defra report presents more problems
than solutions. Tackling these crises will be far more complicated than
just building more nature reserves - a problem that Jim Knight, the
nature conservation minister, acknowledges.
A key issue in sub-Saharan
Africa, for instance, is profound poverty. After visiting the Democratic
Republic of the Congo last month, Mr Knight found it difficult to condemn
local people eating gorillas, already endangered. "You can't blame
an individual who doesn't know how they're going to feed their family
every day from harvesting what's around them. That's a real challenge,"
And the clash between
nature and human need - a critical issue across Africa - is likely to
worsen. As its savannah and forests begin shifting south, migratory
animals will shift along with them. Some of the continent's major national
parks and reserves - such as the Masai-Mara or Serengeti - may also
have to move their boundaries if their game species, the elephant and
wildebeest, are to be properly protected. This will bring conflict with
There is also a
gap in scientific knowledge between what has been discovered about the
impact of climate change in the industrialised world and in less developed
countries. Similarly, fisheries experts know more about species such
as cod and haddock, than they do about fish humans don't eat.
are pessimistic about the prospects of halting, let alone reversing,
this trend. "Are we fighting a losing battle? Yes, we probably
are," one naturalist told the IoS last month.
The UK, which is
attempting to put climate change at the top of the global agenda during
its presidency of the G8 group of industrialised nations, is still struggling
to persuade the American, Japanese and Australian governments to admit
that mankind's gas emissions are the biggest threat. These three continue
to insist there is no proof that climate change is largely manmade.
And many British
environmentalists suspect that Tony Blair's public commitment to a tougher
global treaty to replace the Kyoto Protocol, aimed at a 60 per cent
cut in carbon dioxide emissions by 2050, is not being backed up by the
Government in private.
George Bush's resistance to a new global climate treaty, many US states
are being far more radical. Even the G8 communiqué after the
Gleneagles summit in July had Mr Bush confirming that the climate was
In Alaska last week,
satellite images released by two US universities and the space agency
Nasa revealed that the amount of sea-ice cover over the polar ice cap
has fallen for the past four years. "A long-term decline is under
way," said Walt Meier of the National Snow and Ice Data Centre.
The Arctic's native
communities don't need satellite images to tell them this. John Keogak,
47, an Inuvialuit from Canada's North-West Territories, hunts polar
bears, seals, caribou and musk ox. "The polar bear is part of our
culture," he said. "They use the ice as a hunting ground for
the seals. If there is no ice there is no way the bears will be able
to catch the seals." He said the number of bears was decreasing
and feared his children might not be able to hunt them. He said: "There
is an earlier break-up of ice, a later freeze-up. Now it's more rapid.
Something is happening."
And now, said Mr
Keogak, there was evidence that polar bears are facing an unusual competitor
- the grizzly bear. As the sub-Arctic tundra and wastelands thaw, the
grizzly is moving north, colonising areas where they were previously
unable to survive. Life for Alaska's polar bears is rapidly becoming
Vanishing from the
Already listed as
"critically endangered", only about 700 mountain gorillas,
including the distinctively marked adult male silverbacks, migrate within
the cloud forests of the volcanic Virunga mountains of the Democratic
Republic of the Congo, Rwanda and Uganda. After a century of human persecution
it faced extinction. Now its unique but marginal mountain forests -
already heavily reduced by forestry - are shrinking, because of climate
change. It will be forced to climb higher for cooler climates, but will
effectively run out of mountain.
Across Africa, habitats
are shifting as temperatures rise, or disappearing in droughts, affecting
the migrations of millions of wildebeest, and savannah elephant and
Thomson's gazelle. This will hit game reserves and national parks -
forcing many to move their boundaries.
The number of male
green turtles is falling because of rising temperatures, threatening
their survival. Turtle nests need a temperature of precisely 28.8C to
hatch even numbers of males and females. On Ascension Island, where
nest temperatures are up 0.5C,females now outnumber males three to one.
On Antigua too, nest temperatures for hawkbill turtles are higher than
the ideal incubation level. Hatchling survival rates are also cut by
higher temperatures. Egg-laying beaches for all species of turtle are
being lost to rising sea levels. A third of nesting beaches in the Caribbean
would be lost by a 50cm rise in sea level.
This rare antelope,
thought to be half-way between an antelope and a sheep, and found in
Russia and Mongolia, is "critically endangered". Hunted heavily,
its autumn migration to escape bitter weather and spring migration to
find water and food are being hit by unusual weather cycles. The antelope
will be forced by climate instability to find new grazing areas, coming
intoconflict with humans. Bad years can cut its numbers by 50 per cent,
because of high mortality and poor birth rates.
The migration of
the sperm whale, one of the earth's largest mammals, made famous by
Herman Melville's epic Moby-Dick, is closely linked to the squid, its
main food source. Squid numbers are affected by warmer water and weather
phenomena such as El Niño. Adult male sperm whales up to 20m
long like cold water in the disappearing ice-packs. Warm water cuts
sperm whale reproduction because food supplies fall. Around the Galapagos
Islands, a fall in births is linked to higher sea surface temperatures.
Plankton and krill, key foods for many cetaceans such as the pilot whale,
have in some regions declined 100-fold in warmer water.