There is now little doubt that we live in a warming world and the evidence suggests Man's influence has played a large part. Even if globally we managed a big switch to renewables we'd probably still have warming but I feel we should try to minimise the impact.
A USA website says the average sea level rise over the last 100 years is 7 inches (178mm). Personally, I think the problem will be solved by a combination of global agreements and good engineering. We simply cannot ignore this issue: it will not just go away.
There is a chance that we are entering a Maunder Minimum. This may help us a bit.