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This is one of the reasons why Canada, 这就是为何加拿大 originally a climate change hero -- 它原本是环保英雄－ we were one of the first signatories of the Kyoto Accord. 我们是第一批签署京都议定书的国家之一 Now we're

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And we're replacing that with the largest industrial project in the history of the world, 将它转变成史上最大的工业项目， which is producing the most high-carbon greenhouse gas emitting oil in the world. 生产温室气体排放量最大的

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By counting back through these layers and measuring the amount of lead in each, he could work out global lead concentrations at any time for hundreds, or even thousands, of years. The notion became the foundation of ice core studies, on which much mo

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Lead is a neurotoxin. Get too much of it and you can irreparably damage the brain and central nervous system. Among the many symptoms associated with overexposure are blindness, insomnia, kidney failure, hearing loss, cancer, palsies, and convulsions

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