The correct answer is (d). Carbon trading is not associated with the Montreal Protocol. The Montreal Protocol is an international treaty that was signed in 1987 to protect the ozone layer. It is not related to carbon trading, which is a market-based mechanism that is used to reduce greenhouse gas emissions.
The First World Climate Conference was held in 1979 in Geneva, Switzerland. It was attended by representatives from 37 countries. The conference was the first international meeting to address the issue of climate change.
The First Earth Summit was held in 1992 in Rio de Janeiro, Brazil. It was attended by representatives from 178 countries. The summit adopted Agenda 21, a blueprint for sustainable development.
Earth Summit Plus-5 was held in 1997 in New York City. It was a follow-up to the First Earth Summit. The summit reviewed progress that had been made on Agenda 21 and adopted a new set of goals for sustainable development.