Why would you expect any sea level rise from a melting of the arctic sea ice? No one who knows that ice floats would. And guess what: scientists know, just as well as the general public, that ice floats.
As to forest fires and volcanoes, well, forest fires are part of a cycle of growth and burning. The net result is that the carbon in trees is part of a back and forth between wood and atmospheric CO2. Nets out to zero. As to volcanoes, they're a real source of CO2 to the atmosphere, BUT not nearly as big nowadays as the coal-fired generators of China and the US. (In that order.)