New York Times: Representatives of more than 160 countries began formal negotiations here on Monday on a treaty to address climate change, with the secretary general of the United Nations, Ban Ki-moon, urging governments to help in "saving the planet." The weeklong meeting will lay out the agenda for the talks, which are scheduled to conclude at the end of 2009. A rancorous meeting three months ago in Indonesia exposed deep fissures over how countries plan to approach global warming. "Saving …