>>1 no, with all glaciers melted, the sea level would only rise 70 meters. a lot, but not enough to flood the world entirely.

>>3 we are also at the highest level of carbon dioxide content of all recorded ice core history apparently. and carbon dioxide generally follows the temperature, so its possible that it will get a lot hotter. of course its possible that its because of the sun itself, but we are definitely making an impact though.