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. The worst effect of anthropogenic climate change is supposed to be accelerated sea-level rise. But that fear is the product of superstition, not science. The measurements show that anthropogenic GHG emissions have had no detectable effect on the rate of sea-level rise.
At some coastal locations, sea-level is rising, and at other locations it is falling, because of vertical land motion. The global average is slightly rising, but only about 1.5 mm/year (six inches per century), and the globally averaged rate of sea-level rise is no greater now, with CO2 over 400 ppmv, than it was 85 years ago, with CO2 under 310 ppmv.
This is a 111 year record of sea-level measurements at one particular location in the Pacific, but it is perfectly typical. The blue trace is sea-level, the green trace is CO2. If you know how to read graphs, then it will be obvious that CO2 is not affecting sea-level:
With regards to sea level changes, in many cases we are being tricked, it's not the sea that is rising so fast, it's the land that is sinking.
The variations in sea level trends seen here primarily reflect differences in rates and sources of vertical land motion. Areas experiencing little-to-no change in mean sea level are illustrated in green, including stations consistent with average global sea level rise rate of 1.7-1.8 mm/yr. These are stations not experiencing significant vertical land motion. Stations illustrated with positive sea level trends (yellow-to-red) are experiencing both global sea level rise, and lowering or sinking of the local land, causing an apparently exaggerated rate of relative sea level rise.
The blue trace is sea-level, the green trace is CO2. If you know how to read graphs, then it will be obvious that CO2 is not affecting sea-level:
Various methods have been employed over the years to account for vertical land motion in order
to determine a global absolute sea level rate (e.g. Douglas (1991)). The lastest IPCC report gives
a global sea level rise of 1.7 +/- 0.5 mm/yr for the 20th century (Solomon 2007). This value is in
good agreement with most previous studies (Douglas 1997)
A lot of people have been tricked into believing we will have catastrophic sea level changes that will wipe out our coastal cities, and this is just not the case.
The blue trace is sea-level, the green trace is CO2. If you know how to read graphs, then it will be obvious that CO2 is not affecting sea-level:
No one claims that CO2 affects sea levels. But warming does. It causes thermal expansion of seawater and melting of glacial ice.
A straw man is a common form of argument and is an informal fallacy based on giving the impression of refuting an opponent's argument, while actually refuting an argument that was not advanced by that opponent.
Interesting. Subsidence due to gravity?
A combination of the two, actually.
Next time you see some coastal zone being inundated with 'rising ocean levels' you can investigate, you most assuredly will find that it's a result of land subsidence and not rising sea levels.
Satellite altimetry indicates a global sea level trend of over 3 mm/yr since 1993 (Nerem, Leuliette and Cazenave 2006). The latest satellite altimetry trends can be found at ibis.grdl.noaa.gov... The recent global trend raises the question of whether there has been a recent acceleration over the 20th century rate or if the recent trend is part of a multidecadal global fluctuation in the longer-period rate of 1.7 mm/yr. Some studies have found that the present-day global rate may have been equaled or exceeded for short periods of time earlier in the 20th century (Jevrejeva et al. 2006, Holgate 2007).
Satellite altimetry indicates a global sea level trend of over 3 mm/yr since 1993
Let me see if I have this right. You don't think increasing CO2 levels are causing warming which is, in turn, causing sea level rise?
Been doing that for a while, since before C02 levels became an issue.
Let me see if I have this right. You don't think increasing CO2 levels are causing warming which is, in turn, causing sea level rise?
The observation is that the rate of sea level rise was not much larger during the last 50 years than during the twentieth century as a whole, despite the increasing anthropogenic forcing
Attempts to measure acceleration in global mean sea level (GMSL) have often used comparatively crude analysis techniques providing little temporal instruction on these key questions. This work proposes improved techniques to measure real-time velocity and acceleration based on five GMSL reconstructions spanning the time frame from 1807 to 2014 with substantially improved temporal resolution. While this analysis highlights key differences between the respective reconstructions, there is now more robust, convincing evidence of recent acceleration in the trend of GMSL.
What was Al Gores claim? Twenty feet of sea level rise?