Agence France-Presse: Developing countries most at risk from climate change expressed frustration half way through a two-week UN climate conference that rich countries had not made stronger commitments on cutting greenhouse gases. More than 10,000 delegates from 192 nations are gathered in Poznan, Poland to draft a new international climate change treaty, slated for completion by December next year. The global economic crisis has made already delicate negotiations more difficult. Many …