I should add that IPCC under models B1 (the global planned happy world) without other intervention of the temp/sealevel would only go up 1.8C/180-380cm, versus our current trajectory (assumed as model A1B) 2.8C/210-480. The B in A1B means we migrate to balanced renewable/fossils use, which we are kinda doing, again with no specific emission intervention.
http://www.ipcc.ch/pdf/assessment-report/ar4/syr/ar4_syr.pdf
or summary version:
http://www.ipcc.ch/pdf/assessment-report/ar4/syr/ar4_syr_spm.pdf
and projections for various intervention regimens:
https://docs.google.com/file/d/0B1gFp6Ioo3akUlNpWlpyaXJKY1E/edit