Time is now for climate action

COPENHAGEN — Delegates converged for the grand finale of two years of tough, sometimes bitter negotiations on a climate change treaty, as UN officials calculated that pledges offered in the last few weeks to reduce greenhouse gases put the world within reach of keeping global warming under control. - Page 13

Philippine troops arrest dozens

SHARIFF AGUAK, Philippines — Philippine troops have detained at least 47 people and discovered another major weapons cache after martial law was imposed in a southern province following the country's worst political massacre, officials said. - Page 15

112 die in Russia club fire

PERM, Russia — Grieving relatives began to bury the victims of a nightclub fire that left at least 112 people dead, as four people were ordered held pending an investigation into the worst blaze in decades. - Page 51