We know that over the last 110 years, the sea level was rising. (That's as far back as the data goes)
We know that over the last 20 years, the sea level rose twice as fast. (Using, among other things, satellites).
We know this is caused by melting ice, decreased snowfall, and the thermal expansion of the water.
And we know all of that is caused by the increasing temperature of the planet. As earth gets hotter, the ocean gets hotter. (Interestingly enough, if we had no oceans we would experience a much wider range of temperatures. This is because water is hard to heat up in comparison to most other things.)
No reputable scientist disagrees. But, like with all things, you can bullshit any topic and get a following. Why might this occur with global warming? Because the solution involves cutting our heat emissions. That's expensive.
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