Frugalism
More than a third of all energy usage is affected by what people buy, and how much of it.
In this sense, we can save the planet by being cheap.
We can still have nice things, just not replace them as often.
If you take a walk in a middle-class neighborhood on garbage day, you'll see the type of perfectly-good stuff people throw out.
Examples
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Analysis needed for this section: Consider various types of consumer goods, such as clothing, electronics, kitchenware, furniture etc. For each good, consider how long it could last. Then compare with the status quo of how often people actually replace it. Using the ratio between the two stats, we can calculate what percent of environmental impacts could be avoided if people chose to replace stuff less often.
Tips
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