Sea Levels are Never Still

American Thinker ^ | 06/18/2014 | Viv Forbes

[SeekAndFind]

Sea levels have been rising and falling without any help from humans for as long as Earth’s oceans have existed.

The fastest and most alarming sea changes to affect mankind occurred at the end of the Pleistocene Ice Age. Seas rose about 130m about 12,000 years ago, at times rising at five metres per century. Sea levels then fell as ice sheet and glaciers grew in the recent Little Ice Age – some Roman ports used during the Roman Warm Era are now far from the sea even though sea levels have recovered somewhat during the Modern Warm Era.

Many natural factors cause sea levels to rise - melting of land-based glaciers and ice sheets; warming and expansion in volume of the oceans; extraction of groundwater which ends up in the oceans; and sediments, sewerage, plant debris and volcanic ash washed into the oceans by rivers, storms and glaciers. In addition, tectonic forces cause some blocks of land to rise while others fall, hence the paradox of sea levels appearing to rise on one coastline while falling on another.

Currently the world’s oceans are rising at about 1mm per year, which has not changed much with the great industrialisation since 1945. Amongst all the factors moving the restless sea, man’s production of carbon dioxide is obviously an insignificant player.

Sea levels are always changing, at times very destructively. Waves move sea levels by a few metres and at places like Derby, WA, king tides can move sea levels by eleven metres. Then there are rogue waves up to 30 metres high which have sunk oil tankers, and tsunamis which can smash coastlines with a ten metre wall of water moving at over 800 km per hour.

[SunkenCiv]

The stuff that’s currently afloat in the Arctic would have ZERO impact, you’re right. That one can be shown with some ice cubes in a full glass of water and some time to let them melt, but the idiotic moronic jack-holes who advocate for the political nonsense that is AGW can’t even get that one right.

Much of the ice setting on Antarctica is likewise below sealevel, and if that ice melted, sealevels would actually decline just a bit.

Isostatic rebound of Antarctica and of Greenland would deepen the ocean basin as the landmasses rose, raising capacity a bit, and reducing the overall rise in sealevel — but that’s only in the event of all the ice melting, and that isn’t happening.

Despite the warming that is known to have gone on, on a recurring basis, over the past 2500 years or so, Antarctica has been covered with ice for millions of years (how many millions is a matter of dispute). The leftist trolls who drone on about the allegedly horrendous problem of AGW like to emphasize that millions of years idea, trying to make AGW look like a real problem but all it does is show what complete a-holes they are.

[BroJoeK]

Why don’t you tell us how you **really** feel about it.

;-)

[SunkenCiv]

;’)