✅ Answer: A) Was the first major international conference on environment and established UNEPThe Stockholm Conference (UN Conference on Human Environment, 1972) was the first major international conference on environmental issues. It adopted the Stockholm Declaration (26 principles), established UNEP (United Nations Environment Programme) with HQ in Nairobi, Kenya, and declared June 5 as World Environment Day. India’s PM Indira Gandhi was the only head of government to attend (apart from host Sweden) and famously said “Poverty is the greatest polluter.”

✅ Answer: A) Rio Earth Summit (1992)The CBDR principle was introduced at the Rio Earth Summit (1992) through the Rio Declaration. It recognises that while all countries share responsibility for environmental protection, developed countries bear greater responsibility because they have historically contributed more to environmental degradation and have greater financial and technological capacity. This principle is the basis for why developing countries like India have different (less stringent) obligations under climate agreements compared to developed countries.

✅ Answer: A) Developed countries to earn carbon credits by funding emission reduction projects in developing countriesCDM (Clean Development Mechanism) is one of the three flexible mechanisms under the Kyoto Protocol. It allows developed (Annex I) countries to earn Certified Emission Reductions (CERs) — carbon credits — by funding emission reduction projects in developing countries. This helps developed countries meet their targets cost-effectively while also promoting sustainable development in developing countries. India was one of the largest hosts of CDM projects. The other two mechanisms are Joint Implementation (JI) and Emissions Trading.

✅ Answer: B) 2070India’s updated NDC (submitted 2022) includes: reduce emission intensity of GDP by 45% by 2030 (from 2005 levels); achieve about 50% cumulative electric power installed capacity from non-fossil fuel-based energy resources by 2030; and achieve net zero emissions by 2070. India’s net zero target of 2070 is later than the global target of 2050 advocated by developed countries, reflecting India’s development needs and the CBDR principle. India also launched the “Panchamrit” (five nectar elements) climate targets at COP-26 (Glasgow, 2021).

✅ Answer: A) Are most endangered and commercial international trade is bannedCITES (Convention on International Trade in Endangered Species, 1973) has three appendices. Appendix I includes the most endangered species — commercial international trade is banned (e.g., tigers, elephants, rhinos, great apes). Appendix II includes species not immediately threatened but trade must be controlled through permits (e.g., hippos, sharks, mahogany). Appendix III includes species protected in at least one country that needs cooperation from other countries. India’s Wildlife Protection Act 1972 was amended in 2022 to align with CITES obligations.

✅ Answer: A) It achieved universal ratification and the ozone layer is visibly recoveringThe Montreal Protocol (1987) is widely regarded as the most successful environmental treaty. It achieved universal ratification (197 parties — every UN member state). It successfully phased out over 99% of ozone-depleting substances (CFCs, HCFCs, halons). Scientific assessments show the ozone layer is recovering and is expected to return to 1980 levels by around 2066. The Kigali Amendment (2016) extended the Protocol’s scope to phase down HFCs (potent greenhouse gases used as CFC replacements), potentially preventing 0.5°C of warming.

✅ Answer: A) Dumping of hazardous waste from developed to developing countries (“toxic colonialism”)The Basel Convention (1989) controls the transboundary movement of hazardous waste. It was adopted to prevent “toxic colonialism” — the practice of developed countries shipping hazardous waste to developing countries with weaker environmental regulations. The Basel Ban Amendment (1995) goes further by prohibiting export of hazardous waste from OECD to non-OECD countries. The Basel, Rotterdam, and Stockholm Conventions are collectively called the BRS Conventions and share a secretariat in Geneva, Switzerland.

✅ Answer: A) Access and Benefit Sharing (ABS) of genetic resources — preventing biopiracyThe Nagoya Protocol (2010) was adopted at COP-10 of the CBD in Nagoya, Japan. It deals with Access and Benefit Sharing (ABS) of genetic resources. It requires Prior Informed Consent (PIC) from the country of origin before accessing its genetic resources. Benefits derived from using these resources must be shared fairly with the source country. This prevents biopiracy — the unauthorised use of biological resources and traditional knowledge. India ratified the Nagoya Protocol in 2012 and implemented it through the Biological Diversity Act 2002 and its amendments.

✅ Answer: A) Chilika Lake (Odisha) and Keoladeo Ghana (Rajasthan)India’s first two Ramsar Sites were designated in 1981: Chilika Lake in Odisha (Asia’s largest brackish water lagoon, famous for migratory birds and Irrawaddy dolphins) and Keoladeo Ghana National Park in Bharatpur, Rajasthan (famous for migratory birds, especially Siberian cranes). India now has 75 Ramsar Sites — the largest number in South Asia. The Ramsar Convention (1971) was signed in Ramsar, Iran, and its secretariat is in Gland, Switzerland. World Wetlands Day is celebrated on February 2.

✅ Answer: A) Stockholm Convention (2001)The Stockholm Convention (2001) deals with Persistent Organic Pollutants (POPs) — toxic chemicals that persist in the environment, bioaccumulate in food chains, and travel long distances through air and water. The original “dirty dozen” POPs include DDT, PCBs, dioxins, furans, aldrin, dieldrin, endrin, chlordane, heptachlor, mirex, toxaphene, and HCB. The convention aims to eliminate or restrict their production and use. The Basel Convention deals with hazardous waste movement; Rotterdam Convention deals with hazardous chemicals trade (PIC procedure). All three share a secretariat in Geneva (BRS Conventions).