In which of the following declarations the principle of 'common but differentiated responsibilities' has been adopted?

Rio Declaration

The correct answer is Option (1) → Rio Declaration

The principle of common but differentiated responsibilities (CBDR) was adopted in the 1992 Rio Declaration on Environment and Development. It recognizes that while all states are responsible for environmental protection, developed countries bear a greater responsibility due to their larger contribution to environmental degradation and their greater capacity to address it.