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In page David Legates:

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In his lectures, Legates has acknowledged that humans have a direct impact on the environment. However he has disputed large scale climatological studies where he claims that researchers fail to incorporate sufficient data involving increased solar activity, water vapor as a greenhouse gas, data contamination through expansion of the urban heat island effect surrounding data collection points, and many other key variables in addition to the human chemical emissions that are the sole focus of many climatological studies.[citation needed]