FOR the last two years, Rachel Muston, a 32-year-old information-technology worker for the Canadian government in Ottawa, has been taking steps to reduce her carbon footprint — composting, line-drying clothes, installing an efficient furnace in her three-story house downtown.

About a year ago, though, she decided to “go big” in her effort to be more environmentally responsible, she said. After mulling the idea over for several weeks, she and her husband, Scott Young, did something many would find unthinkable: they unplugged their refrigerator. For good.

“It’s been a while, and we’re pretty happy,” Ms. Muston said recently. “We’re surprised at how easy it’s been.”

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