The reason for this is that the ice was melting from an ice age and brought us to where we were in the 20th and 21st century from there. There was a complete land bridge for example between Asia and Alaska where the Aleutian Islands are now so no one had to take a boat (or kayak) from Asia to get to Alaska and Canada (unless they wanted to).
So, it shouldn't be surprising that sea levels are rising now at all given all present variables.
However, my question is likely a different one which is: "Are we entering a period where a new ice age could begin?"
You might laugh but this is a serious question because global Warming of the kind we are presently experiencing precedes all previous ice ages.
You might ask how this could happen?
I can give you an answer that might surprise you.
When there is too much cloud cover for too long the ground temperatures reduce significantly from no sun reaching the ground. In fact, I live in a place where we have two winters, a strong one from December until maybe April and a 2nd winter not as strong where we have temperatures like now which are highs in the summer from about May until about September or August of temperatures between 50 and 70 degrees because of almost constant cloud cover. What happens is that the heat sucks fog off the ocean and onto the land from about 10 miles to 30 to 50 miles inland. How Far it goes inland depends upon how hot it gets inland and how much suction the upgoing heat inland causes the fog to go inland.
So, what I'm saying here is that heat creates evaporation off the ocean. As this evaporation increases over time there are more and more clouds. At some point the clouds cover the land so much from rain and fog that the land cools. As the land cools when it snows it sticks because the land is cold.
This is what can create another ice age from where we are right now.
You might not believe it but this is how things actually work with the weather during a time like this.
It's true we aren't there yet but we are headed towards likely something like this.
But, it's also true that if the heat cannot be mitigated from human overpopulation then we also could wind up like Venus is now too.
I think I prefer being in an ice age to 600 to 800 degrees on the surface of the earth. Don' you? At least in an ice age you can build igloos or ice caves to live in and survive that way. However, farming might be a problem unless you are at the equator then or something.
Where I live on the coast near San Francisco it has been foggy every day just about from May 1st 2023 until now. The average high temperature has been around 62 to 65 degrees and last night the fog and dew were so thick that my backyard deck was completely soaked in water and moisture from the fog.
It likely will be this way until late August or Early September or later with highs not about 80 degrees Fahrenheit even in September or October. Tourists who want to beat the heat are coming to the San Francisco area from all over the world by the way to be cooler because it is one of the few places this far south that is this cool worldwide. But, if you look at San Francisco Bay area as it gets hotter and evaporates more ocean into clouds it could eventually get like this everywhere with clouds and flooding and then an ice age too I believe.
I guess we will have to wait and see what the weather does next? Right?
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