Contrary to some views, there are very few matters within the science of global warming and climate change which are simple whatever side of the debate is considered. This is especially true of certain headline numbers that colour some commentaries.
Take the oceans as an example. The last ice age has been followed by several thousand years of very slow variation in sea levels, less than 2mm rises per decade. But over the last hundred years, changes in average sea levels have increased ten-fold to a steady annual rate of 2mm per year and a total of about 20cm since 1910.
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