A sceptic is a person who doubts or has disbelief in something, often regarding spiritual or supernatural claims. They tend to be critical thinkers and require evidence before they believe in something.
Usage examples
The climate change sceptic argued that there was not enough scientific evidence to support the idea of global warming.
She was a sceptic when it came to the effectiveness of alternative medicine, preferring traditional medical treatments.
He remained a sceptic of conspiracy theories, believing that most were based on unfounded claims and lacked credible evidence.
Environmentalists often refer to climate sceptics as climate deniers, claimed by their opponents to be a deliberate attempt to ally them in the public mind with far right wing holocaust deniers. (earthtimes.org)
In 2008, Heartland decided to host a conference for climate sceptics in New York — it would be the first of eight conferences for skeptics and deniers (six of them were held in the US, one in Germany and one in Australia). (desmogblog.com)
Whether it is the PDO, or another natural oscillation (my money's on the AMO), which is holding global temperatures more or less constant its significance is not just as a weapon for sceptics in the future. (realclimate.org)