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【单选题】
瑞典科学家发现，地球确实像其他研究者所认为的那样，正在进入一个逐渐变暖的时期。但主要原因并非大气中二氧化碳含量的增多，而是因为地球轴心在逐渐倾斜，地球与太阳之间的距离也在逐渐缩短，于是地球表面气温升高，水的蒸发加剧，大气中的水蒸气也就逐渐增多。而水蒸气其实和二氧化碳一样，也是“温室气体”。因此瑞典科学家提出，造成“温室效应”的罪魁祸首应是不断增多的水蒸气，而不是汽车和工厂排放的二氧化碳。这段文字意在说明（ ）。
A.
地球正在进入一个逐渐变暖的时期
B.
地球变暖的真正原因
C.
地球变暖的主要原因不是汽车和工厂排放二氧化碳的增多
D.
地球大气层中的水蒸气在不断增多
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