Climate Change History
Climate Change History - Related Videos
04:34
Climate Change - Concepts
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2019
The certainty of climate change remains a public controversy despite the consensus among approximately 97% of active climate researchers, who not only agree that the Earth’s climate is changing but also state that this change is intensified by human activity, predominantly carbon emissions 1. The disconnect between the public and the experts is partly due to poor understanding of the mechanisms involved in climate change as well as the differences among essential concepts such as weather and...
08:14
Climate Change - Student Protocol
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2019
Melting Land and Sea Ice ExpandNOTE: This activity is a simulation of land- and sea-ice melting and their effects on water levels. First, label one graduated cylinder as 'Sea Ice' and the other graduated cylinder as 'Land Ice.' Hypotheses: the experimental hypothesis might be that the land ice melting will cause the water level to rise more than the melting sea ice. The null hypothesis would be that there will be no difference in the change in water level between the two containers. Add 10 ice...
01:49
Climate Change - Instructor Prep
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2019
Preparation for the Ice Melt, Greenhouse Gas, and Species Range Activities ExpandTo prepare for the exercise, first print enough data recording tables for students in each group. NOTE: Activities one and two can be done simultaneously, each by half of the class broken up into groups of two to four students, or by all students if desired. If the class will split the activity, separate the data tables accordingly. Students performing activity one will need copies of Table 2 and Table 4. Click...
01:50
Global Climate Change
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2019
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past. Past Periods of Warming and Cooling In the last...
01:27
Microbes and Climate Change
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2026
Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
FAQs
Researchers infer climate drivers by comparing reconstructed conditions with greenhouse-gas measurements and climate-model results. This comparison helps distinguish changes associated with volcanic eruptions, solar variability, ocean circulation, land-use change, and fossil-fuel combustion. The key scientific question is whether a proposed driver can account for the timing and pattern of observed climate change.
Proxy records extend climate evidence beyond the period covered by direct observations. Ice cores, tree rings, ocean sediments, fossil evidence, and historical observations preserve different forms of information about earlier conditions. Using several record types together allows researchers to identify recurring patterns and place recent changes against a much longer environmental background.
Changes in Earth’s energy balance provide a common framework for interpreting both natural variability and modern warming. Volcanic activity, solar variability, ocean circulation, land-use change, and greenhouse-gas increases can alter the climate through different pathways. Historical comparison matters because it links shifts in climate conditions to candidate causes rather than treating every change as identical.
A reconstruction typically combines proxy records with historical observations, then compares the resulting patterns with atmospheric greenhouse-gas measurements and climate models. Researchers use that comparison to evaluate whether the timing and patterns of changes are consistent with particular influences. This workflow turns separate environmental evidence into a broader account of climate variability and warming.
Environmental researchers use the record to place present warming alongside earlier climate shifts, assess potential risks to ecosystems and societies, and improve projections. The historical perspective does not simply describe the past; it supplies context for interpreting current observations and supports decisions about mitigation and adaptation in response to changing conditions.
Climate change history connects physical climate processes with environmental consequences. Evidence about ocean circulation, land-use change, volcanic eruptions, solar variability, and fossil-fuel combustion helps explain why conditions changed, while the resulting context supports evaluation of risks to ecosystems and societies. This makes historical reconstruction relevant to environmental research and planning for future change.