Agence France-Presse: Pledges tabled so far at the UN climate talks for curbing greenhouse-gas emissions would doom the world to warming of as much as three degrees Celsius (5.4 degrees Fahrenheit), an internal UN memo showed Thursday. Nations most at risk from rising sea levels have been pushing for commitments to limit the rise to no more than 1.5 C (2.7 F) over pre-industrial levels while many other countries endorse a maximum of 2.0 C (3.6 F). But the memo seen by AFP concludes that even the …