Water is the most abundant element on the planet. There is every argument for the rising an lowering of sea levels but if there is any rise in sea levels from what I know it’s imperceptible at best. It’s not what the climate change doomsday sayers go on about , positing that it happens virtually in a matter of months.
Water is not even an element.
And, it is not the most abundant compound by any measure except surface area coverage.
Back to chemistry class for you.