evidence: Seas Will Rise in Coming Decades. Climate scientists have developed a consensus that one of the effects of a warming planet is that global sea levels will rise. The degree and timing of SLR, however, still is uncertain, and depends in part upon how much global greenhouse gas emissions and temperatures continue to increase. Figure 1 displays recent scientific estimates compiled by the state for how sea levels might rise along the coast of California in the coming decades. (The figure displays data for the San Diego region, but estimates are similar for other areas of the California coast.) As shown, the magnitude of SLR is projected to be about half of one foot in 2030 and as much as seven feet by 2100. These estimates represent the range between how sea levels might rise under two different climate change scenarios. As shown, the range between potential scenarios is greater in 2100, reflecting the increased level of uncertainty about the degree of climate change impacts the planet will experience further in the future.