Humans cause climate change? 'Jeopardy' host thinks so.

Host of the "Jeopardy" game show Alex Trebek said Wednesday that he's seen the effects of climate change, and that it's caused by human activity.

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"I believe that climate change exists, and is contributed to by human activity," Trebek told Salon.

"I have seen firsthand the effects of climate change, in trips to Antarctica and Mt. Kilimanjaro, both of which are showing huge changes due to global warming," he added.

Trebek said he's a climate believer after "Wheel of Fortune" host Pat Sajak, a climate skeptic, made waves last week for calling global warming alarmists "unpatriotic racists."