In 1992, governments of more than 178 nations and hundreds of NGOs met at the U.N. Conference on Environment and Development (UNCED) in Rio de Janeiro, Brazil and developed Agenda 21, a global agenda for sustainable development in the 21st century. Since this conference, progress has been made on four of the environmental goals listed here; select the exception.
A. improvements to drinking water supplies in poor countries
B. research on ocean pollution
C. removal of lead from gasoline
D. carbon dioxide emissions
E. phasing out ozone-depleting chemicals
Answer: D
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