We are at the Byron Bay Writers Festival and listening to
Tim Flannery and Lisa-ann Gershwin discuss the oceans and their fate. Tim Flannery is no stranger to this audience
and receives a warm welcome. He starts
the discussion by reminding us that the ocean is 500 times bigger than the
atmosphere and hence holds more dissolved gasses. Much of the carbon dioxide that is released
by us into the atmosphere dissolves into oceans, rivers and lakes. Increased acidity upsets the ecological
balance and results in many harmful outcomes such as coral bleaching, one of
the reasons the Great Barrier Reef is at risk.
He discusses the fact that many scientists believe we are on
the cusps of a sixth mass extinction, which could wipe out most of life on
Earth as we know it. A mass extinction
happens when over 75% of all species die in a period that is less than 2
million years. We have had 5 mass
extinctions on Earth over the past 540 million years and many of these have
involved loss of life in the oceans. The
problem with change in the oceans is that it is irreversible.
Acidic water is corrosive to many species such as corals, who
cannot survive when calcium levels in the water go down. Many other species such as shellfish are also
affected and when their numbers go down, their predators die also. I think you get the gist. I’ve done a bit of research on this since
coming back. The oceans have absorbed
about 30% of the CO2 emitted by humans. This amounts to approximately a million tons
an hour! While this is great for life on
land, it is death for life at sea.
At the session is
also Lisa-ann Gershwin talks about her book, Stung. She is often referred
to as the Stinger Lady and enlightens us on jellyfish blooms, something we had
not known about previously. She talks
about the dead zones in the oceans where the blooms are most likely to
occur. We are quite surprised to hear
that a massive jellyfish bloom in Western Australia of sea tomato jellyfish covered
the oceans from Broome to Exmouth for 13 months. She says they were so huge you could see them
from space. If our oceans continue to
warm this will be a huge issue and impact not just our ecosystems but also our
economy! Like the dying coral, the
jellyfish are another indicator that something is wrong with our oceans. Too much nutrients, warming water, not enough
oxygen, a reduction of predators are only some of the reasons for the over
abundance of this species.
Tim Flannery says there are enough signs out there to
indicate something is amiss with the oceans.
He talks about the West Antarctic ice sheet, which is now dislodged and
could collapse at any point. We know the
ocean is warming and Tim indicates that an increase of 1.5 degrees in the
oceans could see the demise of the Great Barrier Reef. He discusses other factors such as the dumping
and dredging of the coal industry, which is also adding fuel to the fire. The current government continues to approve
projects in the reef, which has caused our World Heritage Listing of this site
to be in peril.
It was an extremely enlightening and informative session and
we walked away having learnt that the next 6 years were critical for action.
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