Globe and Mail: Climate change is hanging like a shadow over all international development efforts, a top UN official says, as the world body moves to tackle global warming in a landmark summit this week that will see more than 120 heads of state attend. Helen Clark, head of the United Nations development program, made the comments on Sunday afternoon, while more than 100,000 people marched through New York City to call for tougher action on reducing greenhouse gas emissions. The demonstration coincided with...