Warmist Kevin Trenberth claims that it's "utter nonsense" to suggest that natural cycles cause Arctic sea ice to grow and recede

Ex-UKIP MEP: Our climate change policy was 'very amateurish' | EurActiv

“It became clear in 2005 that the world was not warming and we have been monitoring it closely ever since,” he said. “There are no independent scientific institutes in the world which have not conceded that there has been no global warming for 15 years. That’s a matter of fact, not opinion.”

“Even the IPCC [the UN Intergovernmental Panel on Climate Change] has conceded this,” he added. “I think the Met Office has pretty well endorsed what we’re saying too.”

However, Kevin Trenberth the lead author of the 2001 and 2007 IPCC scientific assessments on climate change told EurActiv that the panel had not made any statement on global warming over the last 15 years. A draft IPCC report to be published next year though would contain “multiple statements” reflecting global warming in that period, he said.
...Bloom also attributes last year’s record Arctic sea ice melt to “a natural cycle which has grown and receded over the years.”

“We regard this as not unusual in the weather cycle over the last 8,000 years,” Bloom said.

“There is no evidence for natural cycles doing that,” Trenberth responded. “And there still has to be a source of energy to melt the ice. As scientists we know that this is associated with global warming and changes in the composition of the atmosphere. What he is saying is utter nonsense.”

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THE UN’s climate change chief, Rajendra Pachauri, has acknowledged a 17-year pause in global temperature rises, confirmed recently by Britain’s Met Office, but said it would need to last “30 to 40 years at least” to break the long-term global warming trend.