What’s going on with the caravan of 4,000 Central American migrants on their way north, heading toward the souther border of the US? We find out by talking to Emily Green. Also, Sarah Chayes tells us about Gen. Abdul Razeq — the Afghan police commander who was killed on the eve of elections in Kandahar. He was one of the most powerful men in Afghanistan and Chayes knew him personally. And, we’ll hear how climate change is making it harder businesses focused on leaf peeping in New England.