The mightiest are native to North America, but big trees grow all over the globe, from the tropics to the boreal forests of the high latitudes.

最高大的树原产于北美，但大树遍布全球——从热带到高纬度的北方森林。

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World forest Ecosystem includes tropical, subtropical, temperate, and boreal forests as well as other woodland.

世界森林生态系统包括热带、亚热带、温带森林，北方针叶林以及其他有林地。

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Birds from every habitat-from boreal forests to subtropical islands-will have to adapt to the shifts in their already compromised habitat.

各个栖居地——从北方森林到亚热带岛屿——的鸟类将不得不适应业已熟悉的环境即将发生的转变。

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Scientists are also concerned about fires in the "boreal forests" of Canada and Russia.

NPR: Stronger Wildfires Part of Emerging Global Pattern

Located in the boreal forests near the village of Harads in northern Sweden, the Treehotel opened its doors in the summer of 2010 and offers six guest rooms.

CNN: Modern design meets nature with Sweden's Treehotel

There are also some ecosystems, such as the boreal forests of Canada and Siberia and the Amazon rainforest, which are huge absorbers of carbon dioxide, but which are changing rapidly because of temperature increases and deforestation.

ECONOMIST: Two new satellites will monitor carbon-dioxide emissions