Agence France-Presse: The financial crisis cannot slow negotiations on a future accord to fight climate change or derail the process, United Nations climate chief Yvo de Boer said here Tuesday. “We can’t afford to let the process slip,” de Boer told AFP on the sidelines of an environment ministers’ meeting in Warsaw paving the way for a UN climate change conference in Poznan, western Poland, in December. “The ministers were very clear that the financial crisis should not be an excuse to slow down …