In 1972, the United Nations hold a meeting in Sweden 小题1:_________ to share ideas about ways t  o take better care of for the 小题2:__________earth．At the summit, people from more than one hundreds 小题3:__________ countries discussed some of the important problems faced 小题4:__________ our planet．Since then, several Earth Summits had been held. 小题5:__________ In 2002, the Earth Summit was held in Johannesburg. 小题6:_________ One of the main theme was “sustainable development”, or 小题7:__________ the question what we can continue developing the world 小题8:__________ without damage the environment．Most of the speakers 小题9:__________ talked the three biggest killers in the world. 小题10:__________ |