答案：C

　　Ⅳ.阅读理解

　　A

　　Scientists studying the impact of climate change on the Arctic need to consider ways to reduce their own carbon footprints(碳排放量)，says Ryan Brook，a researcher who regularly flies north to study the health of caribous(驯鹿)．He calls on scientists to show leadership by examining and sharing ways to reduce the impact of working in polar regions.

　　“The importance of the research is not at question here.It is important to our understanding of and adapting to climate change.But we need to think about better approaches，”says Brook.

　　“This is an issue for all scientists，though polar researchers often travel particularly long distances using commercial air travel.We also rely extensively on small aircraft，icebreakers，and snowmobiles，all of which produce large amounts of carbon.”

　　Brook studies the health of caribou 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.

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