Statement 1 is correct: Agenda 21 is a comprehensive global action plan adopted at the United Nations Conference on Environment and Development (UNCED), also known as the Rio Earth Summit, held in Rio de Janeiro, Brazil, in 1992. It provides a framework for achieving sustainable development by integrating environmental protection, social equity, and economic growth at global, national, and local levels.

Statement 2 is incorrect: The World Summit on Sustainable Development (WSSD), held in Johannesburg, South Africa, in 2002, reviewed and reaffirmed the commitments made under Agenda 21 but did not introduce it. Instead, the summit focused on assessing progress, strengthening implementation, and launching new initiatives, including the Johannesburg Plan of Implementation (JPOI).