Anyone who follows the regular NASA ‘vital signs’ reports on sea level will be aware that the trend in global sea level is for an average rise of 3mm per year (see graph). This correlates with the increasing trend of CO2 concentration of around 2ppm per year (currently 410ppm). There is no significant debate about this. These are the figures accepted by most scientists.
Now, 3mm doesn’t sound much, but multiply by 100 to get us to 2119, that would be 300mm, which is 0.3 metre or about 1 foot – and that’s within the potential lifetime of babies being born today. Yes, you may say, but 1 foot is not much either.
But now consider that
- the rate of sea level rise is increasing as CO2 levels increase,
- the effect is not evenly spread around the globe, for example the East coast of North America is sinking, so the rate is much greater
- the increased weather variability caused by CO2 levels means greater tides, and more flooding
- Scientists are very worried about so-called positive feedback effects whereby CO2 and ice melting would be rapidly accelerated.
Add all this together. What does that mean for the beaches of England that I grew up with. Higher embankments? Loss of sand? Regular inundation? What of other even more vulnerable places?
I was inspired to write this by Jeff Goodell’s book The Water Will Come, which describes how some of the affected communities are today preparing for rises in sea levels – such as southern Florida, Venice, New York, Tokyo, Marshall Islands, Maldives. All are attempting to mitigate the effects, but how can they possibly cope in the long term? Consider that when CO2 concentration was last at this level, sea levels were 20 METRES higher – which it is fairly logical to assume is where we are headed in the long run.
We clearly have a global emergency that is currently being inadequately addressed. If humanity was behaving rationally, a major global programme would be in place to attempt to address and mitigate the effects of this emerging cataclysm. If only. The poorly supported Paris agreement is but a shadow of what is needed.
So all power to those young people, and to campaigning groups such as Extinction Rebellion, who are trying to wake up those in power to their responsibilities.