The 2^nd Conference of the Sustainable development and climate changes, to be held in Nis, Serbia, in September 2010:
http://www.sustainnis.com/en/

24^th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS2011)
July 4-7, 2011, Novi Sad, Serbia
http://www.ecos2011.com