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2013-10-03 08:10:27
By Roger Harrabin Environment analyst
The health of the world s oceans is deteriorating even faster than had
previously been thought, a report says.
A review from the International Programme on the State of the Ocean (IPSO),
warns that the oceans are facing multiple threats.
They are being heated by climate change, turned slowly less alkaline by
absorbing CO2, and suffering from overfishing and pollution.
The report warns that dead zones formed by fertiliser run-off are a problem.
It says conditions are ripe for the sort of mass extinction event that has
afflicted the oceans in the past.
It says: We have been taking the ocean for granted. It has been shielding us
from the worst effects of accelerating climate change by absorbing excess CO2
from the atmosphere.
Whilst terrestrial temperature increases may be experiencing a pause, the
ocean continues to warm regardless. For the most part, however, the public and
policymakers are failing to recognise - or choosing to ignore - the severity of
the situation.
It says the cocktail of threats facing the ocean is more powerful than the
individual problems themselves.
Coral reefs, for instance, are suffering from the higher temperatures and the
effects of acidification whilst also being weakened by bad fishing practices,
pollution, siltation and toxic algal blooms.
Atmospheric threshold
IPSO, funded by charitable foundations, is publishing a set of five papers
based on workshops in 2011 and 2012 in partnership with the International Union
for Conservation of Nature (IUCN s) World Commission on Protected Areas.
The reports call for world governments to halt CO2 increase at 450ppm. Any
higher, they say, will cause massive acidification later in the century as the
CO2 is absorbed into the sea.
It urges much more focused fisheries management, and a priority list for
tackling the key groups of chemicals that cause most harm.
It wants the governments to negotiate a new agreement for the sustainable
fishing in the high oceans to be policed by a new global high seas enforcement
agency.
The IUCN s Prof Dan Laffoley said: "What these latest reports make absolutely
clear is that deferring action will increase costs in the future and lead to
even greater, perhaps irreversible, losses.
"The UN climate report confirmed that the ocean is bearing the brunt of
human-induced changes to our planet. These findings give us more cause for
alarm but also a roadmap for action. We must use it."
'Extinction risk'
The co-coordinator, Prof Alex Rogers from Oxford University has been asked to
advise the UN's own oceans assessment but he told BBC News he had led the IPSO
initiative because: "It s important to have something which is completely
independent in any way from state influence and to say things which experts in
the field felt was really needed to be said."
He said concern had grown over the past year thanks to papers signalling that
past extinctions had involved warming seas, acidification and low oxygen
levels. All are on the rise today.
He agreed there was debate on whether fisheries are recovering by better
management following examples in the US and Europe, but said it seemed clear
that globally they were not.
He also admitted a debate about whether overall climate change would increase
the amount of fish produced in the sea. Melting sea ice would increase
fisheries near the poles whilst stratification of warmer waters in the tropics
would reduce mixing of nutrients and lead to lower production, he said.
He said dead zones globally appeared to be increasing although this may reflect
increased reporting.
"On ocean acidification, we are seeing effects that no-one predicted like the
inability of fish to detect their environments properly. It s clear that it
will affect many species. We really do have to get a grip on what s going on in
the oceans," he said.