Global warming and more water would be good for surfers, right? 

Nope.  Did you see any surfing in "Waterworld" or"The Day After Tomorrow"?  Nope, because higher sea levels mean terrible breaks.  As Sam Kornell at Pacific Standard puts it, "the contour of a wave is as important as its size, and the way a wave builds and breaks is determined chiefly by the shape of the ocean floor as it meets the shoreline."

Even a foot change in the tide line can mean the difference between great and mediocre waves and researchers believe sea levels could rise six inches by 2030, and a foot by 2050, or more.

Until then, at least surfers have epic swells due to the bigger storms.

Will Climate Change Wipe Out Surfing? by Sam Kornell, Pacific Standard