Harmful 'bad' ozone, which acts as a potent air pollutant, is formed in the:
- Stratosphere
- Troposphere
- Exosphere
- Ionosphere
Explanation: Ozone formed in the lower atmosphere (troposphere) harms plants and animals and is a major component of smog.
Which potent greenhouse gas is prominently emitted from flooded rice paddies?
- Carbon dioxide
- Methane gas
- Nitrous oxide
- Sulfur dioxide
Explanation: The anaerobic conditions in flooded rice paddies foster the growth of methanogenic bacteria, making them a major source of methane gas.
Ocean acidification harms marine calcifying organisms by significantly reducing the availability of:
- Sodium ions
- Calcium ions
- Carbonate ions
- Bicarbonate ions
Explanation: Higher ocean acidity depletes carbonate ions, which corals and mollusks desperately need to build their calcium carbonate shells and skeletons.
Chlorofluorocarbons (CFCs) were historically produced and widely used primarily as:
- Agricultural fertilizers
- Automobile fuels
- Fire extinguishers
- Industrial refrigerants
Explanation: Before being banned by the Montreal Protocol, CFCs were heavily manufactured for use as industrial and domestic refrigerants.
Which recent amendment to the Montreal Protocol targets the phase-down of HFCs?
- Doha Amendment
- Kigali Amendment
- Paris Agreement
- Kyoto Protocol
Explanation: The 2016 Kigali Amendment to the Montreal Protocol aims to phase down the production and consumption of hydrofluorocarbons (HFCs), which are potent greenhouse gases.
Although signed earlier, the Montreal Protocol officially became effective in:
- Year 1992
- Year 1989
- Year 1990
- Year 1987
Explanation: The Montreal Protocol was signed in 1987 but officially became effective globally in 1989.
Which greenhouse gas is heavily produced by microbial action in nitrogen-fertilized soils?
- Carbon dioxide
- Nitrous oxide
- Ozone gas
- Methane gas
Explanation: The heavy application of nitrogen-based agricultural fertilizers stimulates soil microbes to release nitrous oxide, a powerful greenhouse gas.
The ozone hole over Antarctica develops prominently each year during:
- Early January
- Late December
- Late August
- Mid June
Explanation: The ozone hole typically forms during the Antarctic spring, spanning from late August through early October.
Globally, which economic sector is the absolute largest contributor to anthropogenic greenhouse gas emissions?
- Agriculture sector
- Transportation sector
- Energy production
- Industrial processes
Explanation: The burning of fossil fuels for electricity and heat production is the largest single source of global greenhouse gas emissions.
Nitrous oxide is an extremely potent greenhouse gas with a GWP approximately:
- 50 times greater
- 10 times greater
- 1000 times greater
- 265 times greater
Explanation: Nitrous oxide has a Global Warming Potential roughly 265 to 298 times that of carbon dioxide over a 100-year period.
UV-A radiation reaches the Earth's surface easily and is less harmful because it has a relatively:
- Long wavelength
- High energy
- High frequency
- Short wavelength
Explanation: UV-A has the longest wavelength of the UV spectrum, meaning it carries less energy and is not significantly absorbed by the ozone layer.
The Montreal Protocol was officially signed by participating nations in which year?
- Year 1992
- Year 1997
- Year 1989
- Year 1987
Explanation: The Montreal Protocol, an international treaty protecting the ozone layer, was signed in Montreal, Canada, in 1987.
Permafrost thawing in the Arctic drastically accelerates global warming by releasing massive amounts of:
- Methane gas
- Carbon monoxide
- Sulfur dioxide
- Nitrous oxide
Explanation: Thawing permafrost releases ancient organic matter that is decomposed by microbes, releasing huge quantities of methane gas into the atmosphere.
The International Day for the Preservation of the Ozone Layer is globally observed on:
- September 16
- April 22
- June 5
- March 21
Explanation: September 16 commemorates the date of the signing of the Montreal Protocol on Substances that Deplete the Ozone Layer in 1987.
The thickness of the ozone layer in a column of air is measured in:
- Centimeter units
- Decibel units
- Dobson units
- Nanometer units
Explanation: Ozone layer thickness from the ground to the top of the atmosphere is measured in Dobson units (DU).
During ozone degradation, released chlorine atoms act continuously as:
- Inhibitor molecules
- Reactant molecules
- Chemical catalysts
- Biological catalysts
Explanation: Chlorine atoms are not consumed in the reaction; they act as catalysts, allowing a single atom to destroy tens of thousands of ozone molecules.
Ozone depletion over Antarctica is severely accelerated during winter by the formation of:
- Cirrus clouds
- Polar stratospheric clouds
- Cumulonimbus clouds
- Tropospheric nacreous clouds
Explanation: Polar stratospheric clouds form in the extreme cold of the Antarctic winter, providing ice crystals that catalyze ozone-destroying chemical reactions.
The Paris Agreement aims to limit the global temperature rise well below:
- Three degrees
- Two degrees
- One degree
- Four degrees
Explanation: The Paris Agreement's central aim is to strengthen the global response to climate change by keeping the global temperature rise this century well below two degrees Celsius above pre-industrial levels.
Which synthetic gases contribute about 14 percent to total global warming?
- Nitrous oxide
- Methane gas
- Chlorofluorocarbons
- Carbon monoxide
Explanation: Chlorofluorocarbons (CFCs) are potent synthetic greenhouse gases that contribute approximately 14% to global warming.
The 'Clean Development Mechanism' (CDM) was a flexible carbon trading mechanism established under the:
- Paris Agreement
- Montreal Protocol
- Cartagena Protocol
- Kyoto Protocol
Explanation: The CDM allowed emission-reduction projects in developing countries to earn certified emission reduction (CER) credits under the Kyoto Protocol.
The Keeling Curve is a famous scientific graph depicting the ongoing atmospheric accumulation of:
- Methane gas
- Ozone gas
- Carbon dioxide
- Chlorofluorocarbons
Explanation: The Keeling Curve tracks the continuous rise of atmospheric CO2 concentrations measured at the Mauna Loa Observatory since 1958.
Ocean acidification is primarily driven by the excessive oceanic absorption of atmospheric:
- Nitrous oxide
- Methane gas
- Carbon dioxide
- Sulfur dioxide
Explanation: Oceans absorb about 30% of anthropogenic carbon dioxide, which reacts with water to form carbonic acid, lowering the ocean's pH.
Global warming directly causes oceanic thermal expansion, which significantly leads to:
- Ocean acidification
- Sea level rise
- Glacial advance
- Ozone depletion
Explanation: As the oceans absorb heat from global warming, the water expands. This thermal expansion is a major contributor to sea level rise.
In the stratosphere, UV rays act on CFCs to release which active atoms?
- Carbon atoms
- Chlorine atoms
- Fluorine atoms
- Hydrogen atoms
Explanation: Ultraviolet radiation breaks the chemical bonds in CFCs, releasing highly reactive chlorine atoms that destroy ozone.
Halons, which are potent ozone-depleting substances used as fire extinguishants, prominently contain:
- Bromine
- Fluorine
- Iodine
- Astatine
Explanation: Halons contain bromine, which is exceptionally efficient at destroying ozone—even more so than chlorine on a per-atom basis.
Ocean warming frequently causes coral bleaching, which is the mass expulsion of symbiotic:
- Cyanobacteria
- Zooxanthellae
- Sponges
- Phytoplankton
Explanation: Thermal stress causes corals to expel their symbiotic algae (zooxanthellae), causing the corals to turn completely white (bleaching).
Which United Nations body assesses the scientific literature related to global climate change?
Explanation: The Intergovernmental Panel on Climate Change (IPCC) is the UN body responsible for assessing the science related to climate change.
The primary internationally agreed objective of the Montreal Protocol is to:
- Reduce global warming
- Save biodiversity
- Control acid rain
- Protect ozone layer
Explanation: The Montreal Protocol was designed specifically to protect the stratospheric ozone layer by phasing out ozone-depleting substances.
High doses of UV-B radiation cause corneal inflammation commonly known as:
- Snow blindness
- Night blindness
- Cataract disease
- Color blindness
Explanation: Excessive exposure to UV-B radiation causes inflammation of the cornea, resulting in a painful condition called snow blindness.
Black carbon (soot) accelerates global warming by absorbing solar heat and severely reducing:
- Stratospheric ozone
- Ocean salinity
- Snow albedo
- Cloud cover
Explanation: When black soot falls on ice and snow, it darkens the surface, reducing its albedo and causing it to melt much faster.
The 'good' ozone that shields Earth from UV radiation is located in the:
- Thermosphere
- Mesosphere
- Troposphere
- Stratosphere
Explanation: Stratospheric ozone is considered 'good' because it absorbs harmful ultraviolet radiation from the sun.
The Intergovernmental Panel on Climate Change (IPCC) was jointly established by UNEP and the:
Explanation: The IPCC was created in 1988 by the World Meteorological Organization (WMO) and the United Nations Environment Programme (UNEP).
Biologically, UV-B radiation is highly mutagenic because it induces severe damage to:
- Protein structures
- RNA strands
- Lipid bilayers
- DNA molecules
Explanation: UV-B radiation directly damages DNA, leading to mutations that can ultimately cause skin cancer and genetic defects.
Which massive natural reservoir acts as Earth's largest active carbon sink?
- Tropical forests
- Ocean water
- Atmospheric gases
- Tundra permafrost
Explanation: The world's oceans are the largest active carbon sink on Earth, absorbing roughly 25-30% of anthropogenic carbon dioxide emissions.
The foundational scientific concept of the greenhouse effect was first proposed in 1824 by:
- John Tyndall
- Joseph Fourier
- Charles Keeling
- Svante Arrhenius
Explanation: Joseph Fourier was the first scientist to calculate that Earth was warmer than it should be, proposing what would later be called the greenhouse effect.
The Montreal Protocol holds the historic distinction of being the first UN treaty to ever achieve:
- Universal ratification
- Zero ratification
- Partial ratification
- Continental ratification
Explanation: The Montreal Protocol is widely considered the most successful environmental treaty, achieving universal ratification by all 198 UN Member States.
Without the natural greenhouse effect, the Earth's average surface temperature would be roughly:
- Minus fifty degrees
- Minus eighteen degrees
- Plus fifteen degrees
- Zero degrees
Explanation: Without the natural greenhouse effect trapping heat, the average temperature at the surface of Earth would have been a chilly -18°C rather than the present average of 15°C.
The severe depletion of the ozone layer is most prominently observed over:
- Tropical zones
- Antarctica
- Arctic circle
- Equatorial zone
Explanation: The 'ozone hole' is a phenomenon characterized by severe depletion of the stratospheric ozone layer, occurring annually over Antarctica.
Which international convention served as the foundational framework for the Montreal Protocol?
- Bonn Convention
- Vienna Convention
- Ramsar Convention
- Basel Convention
Explanation: The Vienna Convention for the Protection of the Ozone Layer (1985) acts as the framework for the international efforts that led to the Montreal Protocol.
Under the Paris Agreement, participating countries submit their specific national climate action plans known as:
Explanation: Nationally Determined Contributions (NDCs) are the core of the Paris Agreement, where countries outline their post-2020 climate actions.
The melting of Arctic sea ice drastically decreases Earth's albedo, directly resulting in:
- Oceanic freezing
- Increased warming
- Stable temperatures
- Global cooling
Explanation: Less ice means less sunlight is reflected back to space. Instead, the dark ocean absorbs the heat, leading to increased warming.
The El Nino effect, causing odd climatic changes worldwide, is largely exacerbated by:
- Ozone depletion
- Deforestation
- Acid rain
- Global warming
Explanation: Global warming disrupts established weather patterns, causing extreme climatic events and exacerbating the El Nino effect.
Water vapor amplifies global warming as higher temperatures cause more evaporation, creating a:
- Cooling cycle
- Neutral feedback
- Negative feedback loop
- Positive feedback loop
Explanation: As temperatures rise, more water evaporates into the air. Since water vapor is a greenhouse gas, this causes even more warming.
Which international treaty initially aimed to set binding emission reduction targets for greenhouse gases?
- Nagoya Protocol
- Kyoto Protocol
- Montreal Protocol
- Cartagena Protocol
Explanation: The Kyoto Protocol was an international treaty that committed state parties to reduce greenhouse gas emissions to combat global warming.
The fraction of incident solar energy reflected directly back to space by Earth is called the:
- Radiative forcing
- Greenhouse effect
- Insolation rate
- Albedo effect
Explanation: Albedo is a measure of the reflectivity of Earth's surface. Ice and snow have high albedo, reflecting significant solar energy.
Which highly energetic ultraviolet radiation is almost completely absorbed by Earth's ozone layer?
- UV-C radiation
- UV-A radiation
- UV-B radiation
- Infrared radiation
Explanation: UV-C radiation is the most energetic and harmful, but it is entirely absorbed by ozone and oxygen in the stratosphere.
Which instrument is traditionally used to measure the thickness of the ozone layer from the ground?
- Anemometer
- Barometer
- Geiger counter
- Dobson spectrophotometer
Explanation: The Dobson spectrophotometer is the earliest and most standard instrument used to measure total column ozone from the Earth's surface.
The Kyoto Protocol was formally adopted by nations in which year?
- Year 1997
- Year 2012
- Year 2005
- Year 1992
Explanation: The Kyoto Protocol was adopted in Kyoto, Japan, on December 11, 1997, and entered into force in 2005.
Polar stratospheric clouds provide an ice surface for the massive spring release of:
- Carbon monoxide
- Nitrogen dioxide
- Ozone molecules
- Active chlorine
Explanation: The ice surfaces of these clouds convert benign chlorine reservoir compounds into highly reactive active chlorine when spring sunlight returns.
The primary natural atmospheric sink responsible for destroying methane gas involves reactions with:
- Nitrate ions
- Ozone molecules
- Hydroxyl radicals
- Chlorine atoms
Explanation: Hydroxyl (OH) radicals act as the 'detergent' of the atmosphere, reacting with and breaking down methane molecules.
Which anthropogenic greenhouse gas contributes the most to total global warming?
- Carbon dioxide
- Nitrous oxide
- Methane gas
- Chlorofluorocarbons
Explanation: Carbon dioxide is the most abundant anthropogenic greenhouse gas, contributing approximately 60% to the total global warming effect.
Methane contributes approximately what percentage to the total anthropogenic greenhouse effect?
- Twenty percent
- Fourteen percent
- Sixty percent
- Six percent
Explanation: Methane is the second most significant greenhouse gas, contributing roughly 20% to global warming.
A major secondary effect of global warming on the world's oceans is widespread:
- Salinity increase
- Algal extinction
- Coral bleaching
- Ocean freezing
Explanation: Ocean warming triggers widespread coral bleaching events, devastating marine biodiversity and reef ecosystems globally.
Carbon sequestration refers to the deliberate, long-term capture and storage of atmospheric:
- Carbon dioxide
- Methane gas
- Nitrous oxide
- Ozone gas
Explanation: Carbon sequestration is the process of capturing and storing atmospheric carbon dioxide to mitigate global climate change.
What is the approximate percentage contribution of carbon dioxide to global warming?
- Six percent
- Twenty percent
- Fourteen percent
- Sixty percent
Explanation: Of the total greenhouse gases, carbon dioxide contributes 60%, making it the dominant driver of global warming.
Global Warming Potential (GWP) is a metric that compares gases relative to:
- Carbon dioxide
- Ozone gas
- Methane gas
- Water vapor
Explanation: GWP measures how much energy the emissions of 1 ton of a gas will absorb over a given period, relative to the emissions of 1 ton of carbon dioxide.
The 'ozone hole' phenomenon was first discovered by British scientists over Antarctica in the:
Explanation: The Antarctic ozone hole was discovered by scientists from the British Antarctic Survey in 1985.
The abnormal warming of Pacific sea surface temperatures that disrupts global weather patterns is called:
- Coriolis effect
- Thermal inversion
- El Nino
- La Nina
Explanation: El Nino is the warm phase of the El Nino-Southern Oscillation, causing extreme weather events that are exacerbated by global warming.
Compared to carbon dioxide, the Global Warming Potential (GWP) of methane over 100 years is roughly:
- 100 times greater
- 300 times greater
- 5 times greater
- 28 times greater
Explanation: Methane is a highly potent greenhouse gas with a GWP of about 28 to 36 over a 100-year timescale compared to CO2.
Greenhouse gases in the atmosphere primarily absorb and re-emit which type of radiation?
- Microwaves
- Ultraviolet rays
- Visible light
- Infrared radiation
Explanation: Greenhouse gases trap heat by absorbing long-wave infrared radiation emitted by the Earth and radiating it back to the surface.