From before human beings learned how to pollute CO2 emissions from cars and coal plants etc. The Earth had a higher sea and ocean level than we currently have today. Climate Change doesn’t have to be 100% human factors, the Earth goes through cycles of hot and cold cycles and was a lot hotter when dinosaurs ruled, and a lot colder during the last ice age.
A lot of global warming/climate change politicians have said the east and west coast of the USA would be under water by now (2017) but we are not seeing that. It could be because Climategate had fudged the numbers to make them look worse than they really are. Climate Change is real, but the numbers were rigged and cherry picked for political reasons which are why we have a lot of climate change deniers now.
Sure we are like the dog in the coffee shop, everything is hot and on fire, but we don’t seem to care too much about it, as long as we have our lifestyles, this is fine, we are ok with the way events are unfolding currently.