Climate change seems to have become a major concern, if not
the major concern, of our time, for many in the West at least, in spite of the competing
furies of war, terrorism, disease and the continued hunger of so many in poorer
parts of the world (not to mention those in need of aid in our own backyards!) Is
this because the others are familiar horrors, and familiarity breeds contempt?
Is it the scaremongering that leads us to believe that if we don’t DO SOMETHING
immediately the climate will go on and on getting warmer until we can’t live on
the planet? – this seems to be a very real fear for many.
As readers of this blog will know, I am not all that
convinced by the case for anthropogenic warming. The world has been much warmer
than it is today, before humans ever arrived on the scene, never mind before
they began burning fossil fuels. Cows emit methane, a much more dangerous
greenhouse gas than carbon dioxide, and the Ice Age plains of Europe were full
of their ancient relatives. But on the other hand, it is clearly true that
carbon dioxide levels in the atmosphere and the oceans are very high, probably
the highest they have been for many millennia, and whether or not this has
caused the relatively modest warming we have experienced over the past century
or two, it is likely to be significant for the overall climate trend of the
planet. However, I think we are concentrating far too much on reducing our emissions of
carbon dioxide, which will only slow down the rise in CO2 levels, and
not enough on reduction of the CO2 that is actually present.
The Earth has a very good balancing mechanism of its own,
which works well if we don’t interfere with it. What is not much discussed,
however, in comparison with reduction in CO2 emissions, is the way
in which we are wrecking the Earth’s own carbon-reduction system. The
rainforests (which are sometimes recognised in public debate as in need of
protection) and the oceans (which seldom are) both play their part. It is fairly well known that the
rainforests take in CO2 through their leaves, as part of the process
by which they make food for themselves, and of course they also very usefully
give out oxygen. A carbon-rich atmosphere should encourage them to grow well,
which is itself part of the Earth’s climatic balancing system. I think we may just
have learned the lesson that it makes no sense to cut down rainforests (which
are long-term environmental investments by the Earth and which cannot be
replaced quickly) in order to plant biofuel plants. I don’t seem to have heard
much about that lately – and you can run cars on waste products from fish and
chip shops, apparently, so I would hope that this madness has now ceased. But
the rainforests still need much more protection from the rich(er) West because
most of them are situated in tropical countries which have less other resources.
We can do far more than we are doing in this regard.
Even more urgent, however, is proper protection of the
oceans as an environment, because they too are a major sink for dissolved carbon dioxide. The fact that CO2
levels in the sea are so high at present means that the sea cannot absorb
any CO2 from the atmosphere, as it normally would. It is effectively
saturated. This may be partly because of the high levels in the atmosphere, but
I think it may also involve some change in the numbers or behaviour of the
plankton that do the absorbing. However that may be (and you only have to read
the hotly debated issues in the scientific and pseudo-scientific press to know
that no one has all the answers!), when I read that a recent survey of the
ocean surface has calculated that across the globe, around 40 per cent of the
surface is affected by human litter, much of it from ocean-going ships of
various kinds, I almost despair. How long will it take us to give as much
attention to our precious marine treasures as we do to galloping carbon dioxide
emissions or (to a lesser extent) to the rainforests. All pollution is a
serious matter, because the Earth can only deal with so much. If we want a
healthy planet to live on we must look after all its elements, quite apart from
the scenic beauty that surrounds us.
I think we are right to be watchful about rising
temperatures. There are tipping points either way which can prevent the Earth
from rebalancing the climate quickly (though so far it has always managed it in
the end, over millions of years). But climate change can be caused by many
different factors, of which carbon dioxide levels are only one, and quite
possibly a small one at that. In any case, if we are really concerned about
these levels then to neglect any part of the Earth’s own system for removing
excess carbon dioxide from the atmosphere seems a form of collective madness.
Sadly, we humans seem rather prone to that – once an idea has taken root, we
can be blind to others even when they are related to it, if they are related at
a tangent. Maybe it is a kind of protective blinkering. After all, ‘human
beings cannot bear very much reality.’ For most of the time, most of us do not
sail the oceans, and so the reality of marine pollution is hidden from us. But
it is real, and it is increasing from an already high level. To clean up the
oceans must be a positive thing to do – but like the atmosphere we all own it,
and must work together to look after it. History suggests that this is the task
that human beings find most difficult. In order to do it, we have to have a
sense of belonging together. But that’s the subject of another posting, another
day!