For students to evaluate information they research, they should be aware of accepted scientific methods for making claims about greenhouse issues and suggesting courses of action, for example evidence, measurement, models and tested models. Students explain their answers. Discuss the need to look after the ocean as it is a resource that helps diminish the enhanced greenhouse effect. 23 and 24, has information on seagrasses around Australia. Groups present their explanation to the class.
Students ask other groups their questions.
Additional learning Students may realise from reading content on some greenhouse-related web sites that there is still considerable debate about the amount of carbon dioxide that different carbon sinks are able to absorb. Students could summarise some of the areas of debate, including the different points of view of different scientists. Students could also summarise the need for people to have accurate quantitative information about the rate that carbon dioxide is being released into and absorbed from the atmosphere, so that informed action can take place.