Evidence shows that although there has been a progressive long-term trend of global cooling during the Quaternary, there have also been several different ice ages, or glaciations, separated by episodes of global warming where the climate was much warmer or more temperate than the present day. Give students time to work out how they want to present their piece of evidence. Some natural processes record the passage of time: for instance, layers of sediments accumulate over many years, and some of them preserve information about weather conditions during the time they were deposited.

Natural climate change in the past proves that climate is sensitive to an energy imbalance. Students may also conduct library and internet research to enhance the information on their topic. High-quality instrumental records spanning the past century exist for most parts of the world, but the records become sparse in the 19th century, and … Source: EPA's Climate Change Indicators (2016) and Petit et al. Students could consider the changing habitats of birds in more detail as evidence for climate change. Data collected and analysed by the Bureau of Meteorology show that 2013 was Australia's warmest year on record, with sea surface temperatures unusually high throughout the year.. Australia’s climate has warmed by 0.9°C since 1910, and the pace of warming has accelerated since 1950. Currently, CO2 is imposing an energy imbalance due to the enhanced greenhouse effect. ... Past consultations; Energy. If the planet accumulates heat, global temperatures will go up. Because trees are sensitive to local climate conditions, such as rain and temperature, they give scientists some information about that area’s local climate in the past. It is a major aspect of climate change which, in addition to rising global surface temperatures, also includes its effects, such as changes in precipitation. Ongoing temperature recordings using thermometers have shown a clear warming of the Earth's temperature over the past few decades. For example, scientists can study what Earth's climate was like hundreds of years ago by studying the insides of trees that have been alive since then.. The evidence for rapid climate change is compelling:

Evidence of global warming Thermometer readings.
Climate change - Climate change - Evidence for climate change: All historical sciences share a problem: As they probe farther back in time, they become more reliant on fragmentary and indirect evidence. Evidence is building that past climate change may have forged some of the defining traits of humanity Ice Age humans left their footprints across what is … The scientific method and climate change: How scientists know Starting in 1958, Charles Keeling used the scientific method to take meticulous measurements of atmospheric carbon dioxide (CO 2) at Mauna Loa Observatory in Waimea, Hawaii. These laid the framework for much that I will describe. And exaggerating climate change … Antarctica hasn’t always had the climate that it has now. In the geological past Antarctica has been much warmer, and fossils indicate that at various times trees have covered much of the continent. Throughout Earth's history, global and regional climate has changed on very long time scales, and many of the past conditions can be discovered by studying natural Teacher Notes.

This graph, known as the Keeling Curve, shows how atmospheric CO 2 has continued rising since then.


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