REYKJAVIK, Iceland (AP) — As rising global temperatures speed up the melting of sea ice in the Arctic Ocean, it’s set off a boom of ships taking routes that previously were frozen and not traversable. The increase in marine Arctic traffic, which received increased attention as President Donald Trump pushed for the United States to take over Greenland , has come with a heavy environmental cost: black carbon, or soot, that spews from ships and makes the ice melt even faster. Several countries are

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