Agence France-Presse: A 12-day UN conference on climate change began Monday to warnings that the impact of global warming could wreak a dark toll in human misery and conflict. “The world community is more and more aware that humankind in its activity just reached the limits of the closed system of our planet Earth,” said Polish Environment Minister Maciej Nowicki, who is chairing the meeting. “Further expansion in the same style will generate global threats of really great intensity — huge …