Actually, the title is inaccurate in that it suggests there is nothing to worry about. On the other hand, just because it is too slow to cause concern as if it were a tornado approaching, doesn’t mean it isn’t real.
The current Atlantic website and magazine has an article presenting the latest findings of scientists who have new tools and insights into climate change. It turns out that in Earth’s history, about 60 million years ago when mammals began to emerge, the atmosphere held 400 ppm (parts per million) of CO2 – the same amount we have in the atmosphere today. The last time CO2 was at 400 ppm (as it is today) was 3 million years ago during the Pliocene epoch, when sea levels were perhaps 80 feet higher than today. Scientists predict the sea level will catch up to the effects of CO2 around the end of the century – which may or may not reach 80 feet. Mariner suggests a homework assignment: using Google Earth, determine how many major cities around the world have an altitude less than 80 feet above our current sea level (The entire shoreline of Florida including the Keys qualifies).
There is more science and environmental change in store, like palm trees in Scandinavia, and an increase in methane from very large swamps covering thousands of square miles. Methane is the chemical that slowly accelerates sea level rise. Mean temperatures in places like the Mediterranean and St. Louis will hover around the 104° mark and have no winter.
This climate future largely is out of our hands. The damage has been done and the results will play out. Interestingly, the International Panel on Climate Change (IPCC) wants to hold CO2 to 1,000 ppm – only 600 ppm more than what we have today. What’s an 80 foot sea rise when it may be possible to wipe out mammalian existence in a few hundred years?
Mariner often hears a common retort: “Well, we won’t be around then.” This response, besides pretending to be an ostrich with its head in the sand, is part of the fact that climate change is so very slow. Yet, the end of the century is just 82 years away. One’s grandchild still may be around to endure the slow, slow inevitable impact on world economy, health and survivability near ocean waters.
Given the current US political position on climate change (fake science – no, undesired science), younger voters will have more than racism and greed to worry about at election time.
 There are so many variables, from the planet’s point of view, that it is difficult to predict actual sea level rise. What worries scientists is current annual sea level rise is increasing geometrically; small amounts now but increasing dramatically over time.