Activists carry placards during a rally in Doha on Saturday to demand urgent action addressing climate change as the United Nations Convention on Climate Change continues in the Qatari capital. The chances of hitting the UN's global warming target are diminishing, but the goal can still be met if greenhouse gas emissions fall by 15 percent by 2020, scientists said. Karim Jaafar / Al-Watan DOHA via Agence France-Presse