Sea Level and Human Global Warming
Human Global Warming does not contribute to rising sea levels. The notion of carbon emissions by humans making a difference to sea level changes is false. Even if the human race pumped all the carbon they could find into the atmosphere for the next 100 years or stopped emitting carbon altogether, the difference would be neglible. Atmospheric carbon does not drive global temperature changes.
Sea Levels are most definelty on the rise, sea level has been rising for 20000 years according to the IPCC and has risen 20 cms over the last 100 years and is still rising at a similar rate of about 2mm a year. Human Global Warming through carbon emissions are clearly not the reason why the sea level is 300-400 feet higher than it was during the last major ice age.
The earths oceans are vast, covering 71% of the surface area with an average depth of about 10000 feet. It weighs a lot as well equating to a mass of about 1.4 million million million tonnes. The vast majority of this mass of water is below 4C. Although surface temperatures can be as high as 25C, it takes a lot of energy for very long periods of time to warm such a mass of water. Pumping carbon into our atmosphere is not adding any extra heat energy into our oceans. The Oceans release way more CO2 into the atmosphere than humans do and oceans also act as a sink for a lot of CO2 depending on local temperature conditions. Phytoplankton and algal blooms in the warm temperate seas act as a sink for CO2 absorbing the gas with photosynthesis and producing the majority of the worlds oxygen supply. Its reasonable to assume that adding extra CO2 will increase productivity in this first step of the food chain and therefore will benefit the entire animal kingdom with extra food resources and a good supply of essential oxygen as a bonus. It doesnt make scientific sense to assume that CO2 is a deadly poison that is going to kill the planet. Releasing CO2 means that gas is now back in the carbon cycle, one atom of carbon is available to be used to build animal and plant bodies and the two atoms of oxygen are available for breathing.
Global sea levels are forecast to keep rising for the next 100 years. Major areas with mass populations such as most cities are in danger of flooding from the sea. Sea Levels are not likely to begin falling until we are well into an ice age. Predictions for the next ice age vary from 3000-10000 years from now. Sea levels could keep rising for upto another 10000 years!
It is clear that sea level changes are beyond human control, if you believe in human global warming then you are acting out the legend of the Viking King Canute sat on his throne on the beach commanding the waves to retreat. Naturally he got wet, so will you if you build your lifestyle at sea level and believe you can make a difference by driving an electric car or stop spending your money because something is not politically green enough.
Even if you believe that sea levels could keep rising for thousands of years. If you live in the south east of England and most of Holland the reality is even worse than you think. Ever since the great flood which created the North Sea about 8000 years ago, sedimentary layers of mud, sand and rock have been building up and are now so heavy that it is depressing the crust under the North Sea. This means that south-east England, northern France, Belgium and Holland are sinking as fast as the ocean is rising. So if you live in these places you can effectively think of doubling global sea level rises.
Sea Levels could be as much as 1 metre or 3 feet higher within 100-150 years. This is assuming we continue with global warming and the sea rises in a slow and predictable way. It is unlikely that we will see a rapid event of flooding unless we see temperatures rise in excess of the last very major warm interglacial called the Eemian where sea levels only got upto 25 feet higher than todays level. During the peak of Eemian 125000 years ago, temperatures were significantly higher than today with trees fluorishing well inside the Arctic circle. More recently there were major flooding events that occured between 14000 to 8000 years ago. Since those major events which peaked at the Holocene Maximum, temperatures have dropped from their peaks, but the oceans are still gradually rising.
Human Global Warming