Hauraki Herald - - OUT & ABOUT -

I write in re­sponse to the anony­mous let­ter ti­tled ‘Dis­ap­pointed’ in your Septem­ber 15 edi­tion.

The mys­tery correspondent as­serts that sea lev­els are ris­ing by ‘‘only 1.3mm per year’’, and that it will take 1,100 years to achieve a rise of 1.5m. Un­for­tu­nately, these as­ser­tions are wrong. They are not sup­ported by the ob­served facts.

The rate of sea level rise has been low, but it is in­creas­ing. Mean sea level has risen by some 230mm since 1880. One might call 23cm ‘min­i­mal’, but it is al­most a quar­ter of a me­tre. In terms of re­cent sea level rise, if you place a ruler along the long-term trend in the graph, ie between 1889 and about 1990, you will see that the rate of rise has in­creased since 1990. The in­creased rate does not look big, but it is there.

The world is get­ting warmer. The ev­i­dence can be found at­mate-in­di­ca­tors/ cli­mate-change-in­di­ca­tors-us-and-

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