evidence: - Over the past 100 years, the sea level rose faster than at any comparable period in the past three millennia. So, to those who try to attribute all of this to natural cycles, no, this isn’t normal. We’ve looked at the natural cycles and they don’t explain what we are seeing now (details here). - The change so far has been relatively small, about 20 cm (7.9 inches). That’s small enough that you might not notice it on an occasional trip to the beach (or when looking at old photos of shorelines and structures), but it is enough that it is already having impacts on coastal properties (McAlpine and Porter 2018; Moftakhari et al. 2015). [...] It is usually around this point that I encounter a particularly comical counterargument. This one is generally stated as a simple experiment that you can do yourself to prove that climate change isn’t causing the sea level to rise. All you have to do is take a cup of water, put some ice cubes in it, mark the water level, then wait for them to melt. Once they have melted you will find that, lo and behold, the water level is unchanged. Therefore, according to those with degrees from Google University, climate change is a myth and the sea level isn’t rising.