It is now early January 2040. Because of global warming, millions of Russians an

Question

It is now early January 2040. Because of global warming, millions of Russians and Americans now live in Siberia and Alaska, respectively. Each year, millions of Canadian, American, Russian, Korean, and Chinese tourists use the fast train link to get to the Bering Strait, which they then cross by way of jet-ferry, jet foil, or hovercraft. An American-Russian joint venture has decided to investigate the construction of a tunnel linking both sides of the Strait. A consulting study has been completed to assess the costs and benefits of the project. The data have been simplified in the following terms:

Explanation / Answer

Ongoing changes in the climate of the Arctic include rising temperatures, loss of sea ice, and melting of the Greenland ice sheet.[1][2][3] The Arctic ocean will likely be free of summer sea ice before the year 2100. Projections as to when precisely this will occur vary between the years 2060

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