Climate Change and Health Practice Questions

Q: Which one of the following was a major outcome of the Earth Summit in Rio de Janeiro in 1992?

Framework Convention on Climate Change. **Explanation:** The **United Nations Conference on Environment and Development (UNCED)**, popularly known as the **Earth Summit**, was held in Rio de Janeiro in 1992. Its primary objective was to reconcile worldwide economic development with environmental protection. **Why Option C is Correct:** The most significant outcome of the 1992 Earth Summit was the adoption of the **United Nations Framework Convention on Climate Change (UNFCCC)**. This international treaty aimed to stabilize greenhouse gas concentrations in the atmosphere to prevent dangerous anthropogenic interference with the climate system. This framework eventually led to the Kyoto Protocol (1997) and the Paris Agreement (2015). **Analysis of Incorrect Options:** * **Option A:** Bio-safety standards were primarily addressed later through the **Cartagena Protocol (2000)**, which focused on the safe handling and transfer of living modified organisms (LMOs). * **Option B:** Global strategies for pandemic control are governed by the **International Health Regulations (IHR)** under the WHO, not the Earth Summit. * **Option C vs D:** While "Agenda 21" (a plan for sustainable development) was an outcome of the summit, it is a non-binding action plan. The **UNFCCC** is the landmark legal framework/convention specifically associated with the Rio Summit in the context of global environmental policy. **High-Yield Facts for NEET-PG:** * **Agenda 21:** A comprehensive blueprint for global action on sustainable development signed at the Rio Summit. * **Convention on Biological Diversity (CBD):** Another key legally binding treaty opened for signature at the 1992 Earth Summit. * **Climate Change & Health:** NEET-PG often links this to the spread of vector-borne diseases (e.g., Malaria, Dengue) and heat-related illnesses. * **Kyoto Protocol (1997):** Focused on reducing greenhouse gas emissions (CO2, Methane, Nitrous oxide, HFCs, PFCs, SF6).

Q: Which of the following is the greatest contributor to global warming as a consequence of human activities and lifestyle?

Carbon Dioxide (CO2). **Explanation:** The correct answer is **Carbon Dioxide (CO2)**. Global warming is primarily driven by the "Greenhouse Effect," where certain gases trap infrared radiation in the Earth's atmosphere. While several gases contribute to this phenomenon, **CO2 is the single largest contributor**, accounting for approximately **60% of the global warming effect** resulting from human activities (anthropogenic sources). Its primary sources include the burning of fossil fuels (coal, oil, gas) and deforestation. **Analysis of Incorrect Options:** * **Methane (CH4):** This is the second most significant contributor (approx. 20%). While it is more potent per molecule than CO2, its concentration in the atmosphere is much lower. * **Chlorofluorocarbons (CFCs):** These are potent greenhouse gases and the primary cause of ozone layer depletion. However, their overall contribution to global warming is smaller (approx. 14%) compared to CO2. * **Ozone (O3):** While tropospheric (ground-level) ozone acts as a greenhouse gas, its contribution is significantly less than that of CO2 or Methane. **High-Yield NEET-PG Pearls:** * **Greenhouse Gases (GHGs) Ranking:** CO2 (60%) > CH4 (20%) > CFCs (14%) > Nitrous Oxide (6%). * **Health Impacts:** Climate change leads to a shift in the geographical distribution of vector-borne diseases (e.g., Malaria, Dengue moving to higher altitudes) and increased respiratory illnesses due to air pollutants. * **Kyoto Protocol:** An international treaty aimed at reducing GHG emissions. * **The "Gold Standard":** CO2 is used as the reference gas for calculating **Global Warming Potential (GWP)**, with a GWP value of 1.

Q: Which gas is primarily responsible for the greenhouse effect?

All of the above. ### Explanation **Concept:** The greenhouse effect is a natural phenomenon where certain atmospheric gases trap heat (infrared radiation) from the Earth’s surface, preventing it from escaping into space. While this process is essential for maintaining a habitable temperature, an excess of these gases leads to **Global Warming**, which has significant public health implications, including the spread of vector-borne diseases and heat-related illnesses. **Why "All of the Above" is Correct:** The greenhouse effect is caused by several gases, each with varying concentrations and "Global Warming Potential" (GWP): * **Carbon Dioxide (CO₂):** The most abundant anthropogenic greenhouse gas, primarily from fossil fuel combustion. It is the largest contributor to global warming due to its sheer volume. * **Methane (CH₄):** Produced from agricultural activities and waste management. While its concentration is lower than CO₂, its warming potential is approximately 25–28 times higher than CO₂ over a 100-year period. * **Sulfur Hexafluoride (SF₆):** An inorganic, odorless gas used in electrical grids. It is the most potent greenhouse gas known, with a GWP nearly 23,500 times that of CO₂. **Incorrect Options:** Options A, B, and C are individual components of the greenhouse effect. Selecting only one would be incomplete, as all three are recognized by the **Kyoto Protocol** as significant contributors to climate change. **High-Yield Clinical Pearls for NEET-PG:** * **Primary Greenhouse Gas:** CO₂ (contributes ~60% to the effect). * **Most Potent Greenhouse Gas:** Sulfur Hexafluoride (SF₆). * **Health Impact:** Climate change expands the geographical range of vectors (e.g., *Aedes aegypti*), leading to an increase in Malaria, Dengue, and Zika. * **Kyoto Protocol (1997):** An international treaty aimed at reducing the emission of six specific greenhouse gases (CO₂, CH₄, N₂O, HFCs, PFCs, and SF₆).

Q: In which year did the Kyoto Protocol come into force?

2005. **Explanation:** The **Kyoto Protocol** is a landmark international treaty linked to the United Nations Framework Convention on Climate Change (UNFCCC). Its primary goal is to combat global warming by committing industrialized nations to reduce greenhouse gas emissions. **Why 2005 is correct:** While the Kyoto Protocol was adopted in Kyoto, Japan, on **December 11, 1997**, it did not immediately become law. It required ratification by at least 55 countries, including enough developed nations to account for 55% of the world's total CO2 emissions. This threshold was met following Russia's ratification, and the protocol officially **entered into force on February 16, 2005**. **Analysis of Incorrect Options:** * **2001 (A):** This year marked the adoption of the **Bonn Agreement** and the **Marrakesh Accords**, which established the operational rules for the Kyoto Protocol, but the treaty was not yet legally binding. * **2003 (B):** No major international climate milestone occurred this year regarding the protocol's enforcement. * **2007 (C):** This was the year of the **Bali Action Plan** (COP13), which focused on post-2012 strategies after the first commitment period of Kyoto. **High-Yield Facts for NEET-PG:** * **Greenhouse Gases (GHGs):** The protocol targets six main gases: Carbon dioxide ($CO_2$), Methane ($CH_4$), Nitrous oxide ($N_2O$), Hydrofluorocarbons (HFCs), Perfluorocarbons (PFCs), and Sulfur hexafluoride ($SF_6$). * **Health Impact:** Climate change is a major Public Health concern, leading to the expansion of vector-borne diseases (e.g., Malaria, Dengue), heat-related illnesses, and respiratory issues due to air pollution. * **Paris Agreement (2015):** The successor to the Kyoto Protocol, aiming to limit global warming to well below 2°C. * **Montreal Protocol (1987):** Often confused with Kyoto; it focuses on **Ozone Layer depletion** (CFCs), not global warming.

Q: Which of the following statements regarding global warming is true?

Carbon dioxide is the major greenhouse gas.. ### Explanation **1. Why Option A is Correct:** Global warming is primarily driven by the **Greenhouse Effect**, where certain gases trap infrared radiation in the Earth's atmosphere. **Carbon dioxide ($CO_2$)** is the most significant greenhouse gas, contributing approximately **60%** to the global warming effect. While other gases like methane ($CH_4$) are more potent per molecule, the sheer volume and atmospheric residence time of $CO_2$ make it the primary driver of climate change. **2. Why the Other Options are Incorrect:** * **Option B:** The ozone layer in the **stratosphere** is beneficial ("Good Ozone") as it protects the Earth from harmful Ultraviolet (UV) radiation. It is ozone in the **troposphere** (ground level) that is a harmful pollutant and a component of photochemical smog. * **Option C:** Chlorofluorocarbons (CFCs) **deplete** the ozone layer. When CFCs reach the stratosphere, they release chlorine atoms that catalyze the breakdown of ozone ($O_3$) into oxygen ($O_2$), leading to the "Ozone Hole." * **Option D:** The Kyoto Protocol (1997) aimed for a **reduction in the emission** of greenhouse gases (specifically 5.2% below 1990 levels), not a "net reduction" (which implies carbon neutrality or sequestration). **3. High-Yield Facts for NEET-PG:** * **Greenhouse Gases (GHGs):** $CO_2$ (60%) > Methane (20%) > Nitrous Oxide (6%) > CFCs (14%). * **Health Impacts:** Climate change increases the range of vector-borne diseases (e.g., Malaria, Dengue), worsens respiratory conditions due to increased allergens, and leads to heat-related morbidity. * **Montreal Protocol:** Focused on substances that deplete the Ozone layer (CFCs). * **Kyoto Protocol:** Focused on reducing Greenhouse Gas emissions. * **UV Radiation:** UV-B is the primary type responsible for DNA damage, skin cancers (Basal Cell Carcinoma, Melanoma), and cataracts.

Question 1

Which one of the following was a major outcome of the Earth Summit in Rio de Janeiro in 1992?

Accepted Answer

Framework Convention on Climate Change

Answer

Setting up of bio-safety standards

Answer

Global strategy for control of pandemics

Answer

Framework on strategies for sustainable development

Question 2

Which of the following is the greatest contributor to global warming as a consequence of human activities and lifestyle?

Accepted Answer

Carbon Dioxide (CO2)

Answer

Chlorofluorocarbons (CFCs)

Answer

Methane (CH4)

Answer

Ozone (O3)

Question 3

Which gas is primarily responsible for the greenhouse effect?

Accepted Answer

All of the above

Answer

Carbon Dioxide

Answer

Methane

Answer

Sulfur Hexafluoride

Question 4

In which year did the Kyoto Protocol come into force?

Accepted Answer

2005

Answer

2001

Answer

2003

Answer

2007

Question 5

Which of the following statements regarding global warming is true?

Accepted Answer

Carbon dioxide is the major greenhouse gas.

Answer

The ozone layer in the stratosphere is harmful.

Answer

Chlorofluorocarbons (CFCs) increase the ozone layer in the stratosphere.

Answer

The Kyoto Protocol set a target for the net reduction of greenhouse gas emissions.

Climate Change and Health — MCQs

Climate Change and Health — MCQs

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