According to Figure 20.5,(in the text) which shows the net costs of all of the ways in which we can cut carbon emissions, the following measure(s) can reduce greenhouse gas emissions while actually also reducing costs:

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Quizplus · Accepted Answer

All of the options listed (better building insulation, more efficient lighting systems, more efficient water heating systems, and more efficient vehicles) are measures that can reduce greenhouse gas emissions while also reducing costs. These measures improve energy efficiency, which not only cuts emissions but also lowers energy consumption, leading to cost savings over time.