Sea Levels to Rise by 200 Feet if Poles Melt
by John Lawrence
Based on 410 ppm which is the concentration of carbon dioxide right now in the atmosphere, the ice on the poles will go completely away albeit at a glacial pace. Concentrations of carbon dioxide have varied between 100 ppm and 300 ppm for hundreds of millions of years, and earth has gone through hot periods in which there was no polar ice and at least one period where the entire earth was encased in ice. Reliable predictions by scientists show that 410 ppm will guarantee the disappearance of ice from the poles and a 200 foot sea level rise which will wipe out most of the east coast including a total disappearance of the state of Florida. The concentration of carbon dioxide in the atmosphere is continuing to increase. It will continue to increase way above the current 410 ppm. Humans are still pouring billions of tons of carbon dioxide into the atmosphere year after year. There has been no diminution of this trend. In fact it is accelerating. The world emits about 43 billion tons of CO2 a year. So already there is enough carbon dioxide in the atmosphere to guarantee that the poles will melt, and the earth will become very hot. And we're still making it worse year after year.
As the oceans warm and the polar ice melts, we are seeing more extreme weather events due to increased water evaporation from the oceans. That increased amount of water in the atmosphere is released in the form of torrential downpours which cause flooding and weather events such as hurricanes. Higher temperatures are also causing droughts and forest fires. Although these events are tragedies for those directly affected, geological history has shown that life can adapt. One of the first major catastrophes the human race will be faced with is the loss of major cities situated close to oceans such as New York, London, Tokyo, Shanghai, Miami and New Orleans. However, humans can adapt to this by just moving further back from the shore lines as sea levels rise wiping out most low lying areas. Of course this will increase anti-immigrant sentiment due to the the number or refugees in the world as humans crowd onto remaining habitable areas. At this stage we will still be better off than Venus which has a runaway greenhouse gas effect and a surface air temperature of 800 degrees F. Its atmosphere is mostly carbon dioxide.
The lesson here is that it is to the advantage of the human race to stop putting carbon dioxide into the atmosphere as quickly as possible. This means major changes to our civilization which human beings are reluctant to make especially in democracies which are governed by the will of the people. While most will give lip service to preserving the planet for future generations, in fact they don't want to do anything that will change their lifestyles or inconvenience themselves in any way. Only when war and pestilence force humans to diminish their numbers on the planet will the human footprint get down to a certain size which, along with the adoption of renewable energy systems, will allow the planet to sustain enough habitable land mass for the furtherance of human life at least for some people. How fast we proceed with changing the human ecosystem in terms of greenhouse gas reduction will determine what kind of a planet future generations will be forced to live on. At the very least it will resemble a hot house earth, similar to conditions which existed millennia ago in which the polar regions were tropical swamps.
