I want to know the answer to the following question:
What year did the United Nations Earth Summit define "biological diversity"?
All the background I'm provided with is that "The 1992 United Nations Earth Summit defined "biological diversity" as "the variability among living organisms from all sources, including, 'inter alia', terrestrial, marine, and other aquatic ecosystems, and the ecological complexes of which they are part: this includes diversity within species, between species and of ecosystems".". Is that enough to answer the question?
Answer: yes