So what does IPCC say about global sea level.
http://www.ipcc.ch/pdf/assessment-report/ar5/wg2/WGIIAR5-Chap30_FINAL.pdf
30.3.1.2. Sea Level
The rate of sea level rise (SLR) since the mid-19th century has been larger
than the mean rate during the previous two millennia (high confidence).
Over the period 1901–2010, global mean sea level (GMSL) rose by 0.19
(0.17 to 0.21) m (WGI AR5 Figure SPM.3; WGI AR5 Sections 3.7, 5.6,
13.2). It is very likely that the mean rate of global averaged SLR was
1.7 (1.5 to 1.9) mm yr between 1901 and 2010,
2.0 (1.7 to 2.3) mm yr between 1971 and 2010,
3.2 (2.8 to 3.6) mm yr between 1993 and 2010
(WGIAR5 SPM, Section 3.7).
These observations are consistent
with thermal expansion of the Ocean due to warming plus the addition
of water from loss of mass by melting glaciers and ice sheets. Current
rates of SLR vary geographically, and can be higher or lower than the
GMSL for several decades at time due to fluctuations in natural variability
and ocean circulation (Figure 30-5). For example, rates of SLR are up to
three times higher than the GMSL in the Western Pacific and Southeast
Asian region, and decreasing in many parts of the Eastern Pacific for
the period 1993–2012 as measured by satellite altimetry (Figure 30-5;
WGI AR5 Section 13.6.5).
SLR under increasing atmospheric GHG concentrations will continue for
hundreds of years, with the extent and rate of the increase in GMSL
being dependent on the emission scenario. Central to this analysis is
the millennial-scale commitment to further SLR that is likely to arise
from the loss of mass of the Greenland and Antarctic ice sheets (WGI
AR5 Section 13.5.4, Figure 13.13). SLR is very likely to increase during
the 21st century relative to the period 1971–2010 due to increased
ocean warming and the continued contribution of water from loss of
mass from glaciers and ice sheets. There is medium confidence that
median SLR by 2081–2100 relative to 1986–2005 will be (5 to 95%
range of process-based models): 0.44 m for RCP2.6, 0.53 m for RCP4.5,
0.55 m for RCP6.0, and 0.74 m for RCP8.5. Higher values of SLR are
possible but are not backed by sufficient evidence to enable reliable
estimates of the probability of specific outcomes. Many semi-empirical
model projections of GMSL rise are higher than process-based model
projections (up to about twice as large), but there is no consensus in
the scientific community about their reliability and there is thus low
confidence in their projections (WGI AR5 Sections 13.5.2, 13.5.3, Table
13.6, Figure 13.12).
It is considered very likely that increases in sea level will result in greater
levels of coastal flooding and more frequent extremes by 2050 (WGI
AR5 Section 13.7.2; IPCC, 2012). It is about as likely as not that the
frequency of the most intense storms will increase in some ocean basins,
although there is medium agreement that the global frequency of
tropical cyclones is likely to decrease or remain constant (WGI AR5
Sections 14.6, 14.8). Although understanding of associated risks is
relatively undeveloped, coastal and low-lying areas, particularly in
southern Asia, as well as the Pacific Ocean and North Atlantic regions,
face increased flood risk (Sections 5.3.3.2, 8.2.3.3, 9.3.4.3). Future
impacts of SLR include increasing penetration of storm surges into
coastal areas and changing patterns of shoreline erosion (Section 5.3),
as well as the inundation of coastal aquifers by saltwater (Sections
5.4.2.5, 29.3.2). Regionally, some natural ecosystems may reduce in
extent (e.g., mangroves), although examples of habitat expansion have
been reported (Brown et al., 2011). Overall, changes to sea level are
very likely to modify coastal ecosystems such as beaches,salt marshes,
coral reefs, and mangroves (Section 5.4.2; Box CC-CR), especially where
rates of sea level rise are highest (e.g., Southeast Asia and the Western
Pacific).
So what are the impacts?
I found this website that gives us the information from a US perspective.
Witness Panel 1
I'll look for impacts for Canada but since we have a climate change denial leader that info will be hard to find. I suspect if it gets in the way of his tarsands agenda the budget is gone and no one is left to do the work....
