Topic 4 - Real World Problem: Culprits of Climate Warming and Cooling

Oct 16, 2026

Uploaded by SANS

Real World Problem activity on Earth’s climate change investigates how planetary atmospheres shape surface temperatures and how significant factors drive long-term climate variability. It reviews evidence from historical temperature records, climate proxies, and atmospheric carbon dioxide sources and sinks, then connects CO2 trends, population growth, and the greenhouse effect. Students use the provided module understandings to write an evidence-based essay addressing relationships among climate drivers and potential responses to human-enhanced greenhouse warming.

LanguageEnglish

CategoryExam

FormatPDF

Pages44

Reading Time1 h 51 min

AccessFree to download

Student Activities

Topic 4, Real World Problem: Culprits of Climate Warming and Cooling

Questions for the Essay

References for further study

T o p i c4 Activity A Activity B Activity C Activity D How do Atmospheres Affect Planetary Temperatures? How do Atmospheres Interact with Solar Energy? How do Atmospheres Produce their Effect Upon Surface Temperatures? Can We Model an Atmosphere’s Effect Upon a Planet’s Surface Temperature? Can Venus and Mars Be Made Habitable? Student Activities C o n s i d e r i n g a R e a l W o r l d P r o b l e m Culprits of Climate Warming and Cooling When we speak of climate we generally think in terms of long time scales – decades or centuries. A great debate about climate has been ongoing for more then 30 years concerning the culprits of climate change and their importance. We know that many factors help produce a planet’s climate. On Earth, we know both human and natural activities play roles in the climate system. A major challenge facing climate researchers is to identify significant relationships between these factors and explain their influence on climate in ways that are objective and useful to the public and to policymakers. Scientists believe Earth’s early climate naturally fluctuated between ice ages and fairly warm periods. While direct measurements of global climate began in the 20th century, scientists have discovered “proxy” measures of climate in ice cores, tree rings, pollen remains, and ocean sediments that enable them to construct a history of Earth’s climate. By most assessments, the climate over the past 1000 years has continued to fluctuate but to a much lesser degree. This fairly stable range of variability has had two notable exceptions. From the 9th to the 14th centuries there was a period known as the Medieval Warming and then the Little Ice Age occurred from the 16th to 19th century. Figure 4.1 above depicts departures from the mean global temperature over the past 1000 years. In addition to changes in Earth’s climate, throughout Earth’s history the amount of gases in the atmosphere has also varied significantly. One of these gases is carbon dioxide. Carbon dioxide (CO2) is produced from many different sources. Some examples include: forest fires, human-made combustion of fossil fuels, volcanic eruptions, decayed plants and animals, evaporation from the ocean and human breathing. It is removed from the atmosphere by several processes or sinks, such as photosynthesis, ocean plankton and forests and grasslands. In 1958, Dave Keeling began measuring atmospheric CO2 concentrations from Mauna Loa, Figure 􀀴 . 􀀱 . Historical temperature variability in the Northern Hemisphere. Student Activities 􀀱0􀀶 Topic 􀀴, Real World Problem: Culprits of Climate Warming and Cooling Figure 􀀴 .􀀲 . Carbon dioxide concentration. Source: Dave Keeling and Tim Whorf (Scripps Institution of Oceanography). Hawaii. The graph in figure 4.2 shows the data obtained by Keeling and Whorf (1998), representing the longest continuous record of directly measured CO2 concentrations. Consider that at the end of the 18th century, the beginning of a time referred to as the Industrial Revolution, CO2 concentrations were 280 parts per million and rose to 370 parts per million during the 20th century. They continue to increase at an annual rate of 1.2 parts per million. Interestingly, at the beginning of the 18th century the world’s population reached 1 billion. In the period after World II, there was a “baby boom,” with the world’s population increasing dramatically. Today, Earth is home to 6.5 billion humans. Current growth is exponential, with the highest rates and populations found in developing countries in Asia, Africa and Latin America. Figure 4.3 illustrates the actual and projected growths in global population. Figure 􀀴 .􀀳 . World population record and projection. Source: United Nations, World Population Prospects, 􀀱998 Revision; and estimates by the Population Reference Bureau. Student Activities Topic 􀀴, Real World Problem: Culprits of Climate Warming and Cooling 􀀱0􀀷 Using the data p

FAQs

What significant factors influence a planet’s climate, especially Earth?

The activity emphasizes relationships among atmospheric gases, especially carbon dioxide, and how atmospheres interact with solar energy to affect surface temperatures. It also highlights historical variability and the role of human and natural activities in shaping the climate system.

How are carbon dioxide, temperature, and population trends related to the greenhouse effect?

Students are asked to explain how the greenhouse effect works and how past-century trends in CO2, temperature, and population may influence that process and Earth’s climate. The activity links rising CO2 concentrations to greenhouse warming mechanisms.

What should be considered if human activities strengthen the greenhouse effect?

The prompt asks students to describe how other climate factors could respond, including potential changes in Earth’s albedo. It further asks whether differing albedo-factor changes would produce different effects on Earth’s climate.

Oct 16, 2026

Uploaded by SANS