Step 1: Brundtland Report
The Brundtland Report, published in 1987 by the World Commission on Environment and Development (WCED), introduced the concept of sustainable development. It is also known as the "Our Common Future" report.
Step 2: Antarctic Treaty
Signed in 1959, the Antarctic Treaty aims to preserve Antarctica for peaceful scientific research and prohibit militarization or nuclear testing.
Step 3: Antarctic Environmental Protocol
The Protocol on Environmental Protection to the Antarctic Treaty, commonly called the Antarctic Environmental Protocol, was signed in 1991. It regulates activities in Antarctica to protect its environment.
Step 4: Earth Summit in Rio de Janeiro
Referred to as the United Nations Conference on Environment and Development (UNCED), the Earth Summit took place in Rio de Janeiro, Brazil, in 1992. Its focus was on environmental sustainability and global development.
Step 5: Final Answer
Therefore, the correct pairings are:
(A) Brundtland Report - (IV) 1987
(B) Antarctic Treaty - (III) 1959
(C) Antarctic Environmental Protocol - (II) 1991
(D) Earth Summit in Rio de Janeiro - (I) 1992