Choose the option among A, B, C or D that best answers the question about the passage:

"The United Nations Environment Program (UNEP) encourages and coordinates sound environmental practices throughout the world. It grapples with ways to approach environmental problems on an international level, provides expertise to member countries, monitors environmental conditions worldwide, develops environmental standards, and recommends alternative energy sources.
 UNEP‘s work is guided by principles adopted at the 1992 UN Conference on Environment and Development, also known as the Earth Summit. The summit, which took place in Rio de Janeiro, Brazil, was the largest such conference ever held, attracting with more than 100 national leaders.
 The major theme of the 1992 Earth Summit was sustainable economic development, meaning development that does not use up or destroy so many of the world’s natural resources that it cannot be sustained over time. The meeting produced an overall plan, called Agenda 21, in which large developing countries promised to develop their Industries with an eye to protecting the environment. Industrialized countries pledged to help them do that. The Earth Summit also produced major treaties on biodiversity and global warming, although the latter treaty lacked enforcement provisions.
 In 2002, UNEP sponsored the World Summit on Sustainable Development in Johannesburg, South Africa. This conference sought to help developing countries, undergo industrialization without harming the environment. But progress on environmental issues is slow because proposed Solutions continue to pit the interests of poorer developing countries against those of richer industrialized nations. Most developing countries cannot afford to build an environmentally sound industrial base, while industrialized countries are unwilling to absorb the entire cost of environmental reform."

2. In the Earth Summit in 1992, what was passed?

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