Rising carbon dioxide concentrations are already causing the planet to heat up. ... Greenhouse warming doesn't happen right away because the ocean soaks up heat. This means that Earth's temperature will increase at least another 0.6 degrees Celsius (1 degree Fahrenheit) because of carbon dioxide already in the atmosphere
Global warming would reach its peak and glaciers will melt causing sea level rises and floods. More storms and cyclones. Many low lying countries will get submerged under water.
