The concentration of carbon dioxide in the earth’s atmosphere continued to rise; indeed, it is higher today than it has been for centuries. And yet, for the last 15 years, according to the conventional way of measuring global warming, the planet does not seem to have become any hotter.
西雅图—二十世纪的后二十五年，地球表面平均温度呈现稳步上升之势。接着，升温停止了，连科学家也大吃一惊。大气中二氧化碳浓度在继续上升；事实上，今天的浓度比几个世纪以来都要高。但是，在过去15年中，按衡量全球变暖的传统指标，地球并未变得更热。