The truth is, even if Singapore does NOTHING to add to the carbon in the atmosphere, the sea levels WILL rise. For the simple reason that ALL the carbon in the atmosphere that was added in the last 100 years (or since the start of the Industrial revolution) is already melting glaciers and polar ice caps, and permafrost, and these are reducing albedo effects, and releasing methane (in the permafrost) and earth is already in a runaway cascade of heating up. EVEN if Singapore completely shuts down our carbon emission TODAY, it will not matter to the world.
Singapore is less than 0.01% of the population of the world, and our land area is less than 0.001% of the world's land area. Our environmental impact on the WORLD will have less than negligible impact on sea level rise. Heck, if somehow a virulent and deadly pandemic wipes out the entire population of Singapore today, so we do not produce and pollute one MORE atom of carbon from today onwards, the sea levels WILL STILL RISE.