Quiz Archive
Global Warming Quiz Archive
Global Warming: Causes, Evidence, Impacts & Solutions
Revisit this archived global warming challenge and explore greenhouse gases, Earth’s energy balance, ocean heat, melting ice, sea-level rise, climate feedbacks and practical solutions for reducing climate risk.
🌍 Global Warming Quiz • ✨ 10 Verified Questions • ⏱️ 150 Seconds
🏭 Causes & Emissions
🌡️ Evidence & Warming
🌊 Oceans & Ice
🌱 Climate Solutions
This archived edition preserves the original questions, explanations and scoring experience.
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1
What best describes global warming?
Correct answer: The long-term rise in Earth’s average surface temperature. Global warming refers specifically to the sustained increase in Earth’s average surface temperature. Climate change is the broader term because it also includes long-term changes in rainfall, ice, sea level, ecosystems and extreme-weather patterns.Key distinction: A cold day or an unusually cool season does not disprove global warming; climate trends are measured across large areas and long periods.
2
What is the main cause of the rapid global warming observed since the 19th century?
Correct answer: Human activities, especially burning coal, oil and natural gas. Fossil-fuel combustion raises atmospheric carbon dioxide, while agriculture, industry and land-use change add other heat-trapping gases. The IPCC concludes that human influence has unequivocally warmed the atmosphere, ocean and land.Scientific context: Natural influences still affect climate from year to year, but they cannot explain the strong long-term warming trend measured since the industrial era.
3
Which greenhouse gas has contributed the most to human-caused global warming?
Correct answer: Carbon dioxide. Carbon dioxide is released mainly by burning fossil fuels, cement production and deforestation. It is not the only greenhouse gas, but its large emissions, rising concentration and long-lasting influence make it the biggest contributor to current human-caused warming.Important nuance: Methane traps more heat per molecule over shorter time periods, yet carbon dioxide contributes more overall because far more is emitted and much of it remains in the climate system for a very long time.
4
What does Earth’s natural greenhouse effect do?
Correct answer: It slows the escape of infrared heat and keeps Earth warm enough for life. Greenhouse gases absorb and re-emit some of the infrared energy leaving Earth’s surface. This natural process makes the planet habitable; global warming occurs when added greenhouse gases strengthen that heat-trapping effect.Energy-balance insight: The gases do not form a solid “roof.” They interact with particular wavelengths of infrared radiation moving through the atmosphere.
5
Where has most of the excess heat added to Earth’s climate system been stored?
Correct answer: In the oceans. The ocean absorbs about 90 percent of the excess heat associated with planetary warming. Rising ocean heat content affects marine ecosystems, contributes to sea-level rise through thermal expansion and can influence weather and climate patterns.Why it matters: Surface air temperature is only one climate indicator. Ocean heat content provides a powerful measure of the energy accumulating in the Earth system.
6
Which pair is responsible for most global sea-level rise as the planet warms?
Correct answer: Thermal expansion of seawater and melting land ice. Water expands as it warms, and glaciers plus ice sheets add water to the ocean when they lose land-based ice. Melting floating sea ice has little direct effect on sea level because it already displaces water.Local variation: Sea level does not change equally everywhere. Ocean circulation, gravity, winds and vertical land movement can make local trends differ from the global average.
7
How can shrinking snow and ice amplify warming through the ice–albedo feedback?
Correct answer: Darker land and ocean absorb more sunlight after reflective ice disappears. Snow and ice have high albedo, meaning they reflect a large share of incoming sunlight. When they shrink, darker surfaces absorb more solar energy, causing additional warming that can promote further melting.Feedback meaning: A positive climate feedback amplifies an initial change; it does not mean the outcome is beneficial.
8
Which action is an example of climate-change mitigation?
Correct answer: Replacing fossil-fuel electricity with low-carbon energy. Mitigation limits climate change by reducing greenhouse-gas emissions or strengthening carbon sinks. The other choices are adaptation measures because they reduce harm from climate impacts that are occurring or expected.Both are needed: Mitigation lowers future warming, while adaptation helps communities manage risks that can no longer be fully avoided.
9
Why does additional atmospheric carbon dioxide contribute to ocean acidification?
Correct answer: Dissolved CO₂ forms carbonic acid, lowering pH and reducing carbonate availability. The ocean takes up part of the carbon dioxide emitted to the atmosphere. The resulting chemical reactions increase hydrogen-ion concentration and reduce carbonate ions used by many corals and shell-forming organisms.Terminology note: “Acidification” means the ocean is becoming less alkaline. Average seawater remains above neutral pH, but even modest chemical shifts can affect marine biology.
10
According to NOAA’s global climate analysis, how did June 2026 rank among all Junes in the 1850–2026 record?
Correct answer: Second warmest, behind June 2024. NOAA reported that the June 2026 global surface temperature was 1.09°C (1.96°F) above the 20th-century average. It was the second-warmest June in the 1850–2026 record, and all ten warmest Junes had occurred since 2015.Reading records carefully: A monthly ranking describes one month in the global record; the long-term warming conclusion rests on many independent observations measured across decades.
Verification note: The definitions, causes, greenhouse physics, ocean heat, sea-level mechanisms, climate feedbacks, solution terminology, ocean chemistry and June 2026 temperature record were checked against NASA, IPCC AR6, NOAA Ocean Service, NOAA NCEI and U.S. EPA.