Crustal shift (i.e. rising and falling) and/or local water level changes explain all of those events. If it was due to a rising of global water levels it would be more pervasive globally, with many more coasts experiencing it, not just in very contained, specific areas, while other areas remain relatively the same or actually experience a lowering of water level. New islands are popping up all the time, just as old islands disappear, with some coasts shrinking as others grow. It's nothing new, and it has absolutely nothing to do with CO2-driven global warming. It's happened continuously throughout the entire history of the planet, and it always will. Sorry, but these examples are meaningless and do not support your stance in the debate.
Let’s throw some other questions out there. Explain why a once lush, green wilderness became the Sahara desert (note: one study suggests it fluctuates in sync with monsoon activity in about a 20,000-year cycle). How did a planet that was once so warm that what is now the arctic flourished with plant and animal life, and at another time was so oxygen-rich that animals grew many times larger than they are now? Why do ice core samples show CO2 levels many times higher than current levels during much colder ice age periods (e.g. during the Ordovician-Silurian and the Jurassic-Cretaceous periods CO2 levels were greater than 4,000 ppm, and about 2,000 ppm respectively--to compare, right now it's at about 400 ppm).
For further context, consider the fact that temperatures were higher 8,000 years ago, 6,000 years ago, 2,000 years ago, and again 1,000 years ago, all with CO2 in the range of 280 ppm. In the Eemian period 120,000 years ago, global temperature was 2C higher, sea level was 6 m higher, and CO2 was 280 ppm, while just prior to the Cryogenian period 650 million years ago CO2 levels were as high as 7,000 ppm, and yet the Earth was so cold it was almost entirely covered with ice, dubbed the “snowball Earth”. There are eight known drivers on climate, of which CO2 at these levels is perhaps the least significant because of the exponential decline of its effect after reaching 50% in the first 20 ppm. For example, the next doubling to 800ppm will increase its GHG effect by less than 2%, overshadowed by the other drivers, both positive and negative.
How do climate alarmists just dismiss all of this?
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Never believe. Always question. Rebuke belief, a.k.a. bias, a.k.a. groupthink, a.k.a. ideology, the bane of skeptical, logical reason.
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