BBCWorld : Climate change is a global challenge, and its impacts will affect the whole world. But the poorest people in developing countries will be first and hardest hit. With the UN climate change summit in Copenhagen just weeks away, agreeing a new global climate treaty is more critical than ever. As part of our research and communications project Africa Talks Climate, we asked delegates at the recent European Development Days conference in Stockholm, Sweden: "What needs to be agreed to prevent catastrop