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Physicist by training, "Climate Guy" by blog, Denis Rancourt.
Carbon dioxide levels in the atmosphere are on the rise. That's one thing even the climate change skeptics can't challenge.
And most climate experts agree that CO2 emissions from humans is increasing Earth's overall temperatures at a faster rate than at any other time in recorded history.
However, there are some people out there - even scientists - who question whether Earth will, in fact, warm up over the next 100 years and how it will effect Earth's overall climate and ecosystems.
Here are some of the scientists who have gone on record with their controversial views: