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