Brook studies the health of caribous herds in Nunavut and Northwest Territories.He works with northern wildlife managers.This work typically takes him north five or six times per year and when he calculated his own carbon footprint, he was not happy with the result.

　　“My research footprints are about the same as the annual footprints of an average Toronto resident.Basically, I have two footprints—my own personal life, which is moderate, and my research footprint.”

　　Climate scientists can rightly argue that Arctic research is a specialized field and the community of scientists who travel north is relatively small.Even if all scientists working in the north reduced their carbon emissions, it would not make a big impact on the global scale.For Brook, it's the option that matters.

　　There are ways researchers can reduce the amount of carbon they use.Some helicopters use less fuel than others.Solar and wind power are alternatives to gas­fired generators.And while carbon offsets(抵消) don't reduce the amount of carbon emitted, they are an easy first step.

　　“There aren't necessarily any easy answers, but we need to start talking about it.” says Brook.“This is particularly important for the next generation of scientists being trained and I hope to see them become leaders in this issue.”

　　67．The underlined word“It” in Para.2 refers to________.

　　A．the research of climate change on the Arctic

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