Reuters: Why does it seem so hard to put a credible face on the human impact of climate change? The latest effort to do so – a report commissioned the Global Humanitarian Forum (GHF), a Geneva-based organisation led by former U.N. Secretary-General Kofi Annan, and released on Friday – has been criticised for what some say is the shakiness of its data. The study, carried out by Dalberg Global Development Advisers, estimates that climate change kills about 315,000 people a year through hunger, …