There isn't any credible evidence that natural cycles are the exclusive or even the predominant cause of this episode of warming. The current pace of warming is far exceeding anything in the last 800,000 years, a period which includes a number of glaciations. If you set a graph of temperature rise since the start of the industrial revolution against a graph of atmospheric carbon dioxide increase, the match is shudderingly close. That doesn't prove cause and effect, of course, but you'd have an uphill struggle to disprove the connection for several reasons: we know that carbon dioxide is a greenhouse gas; we know that warming is continuing despite the fact that solar output has decreased slightly over the last forty years; we know that solar warming would heat the whole atmosphere, yet the troposphere is warming whilst the stratosphere is cooling - and guess what? It's in the troposphere where the extra CO2 is being generated, almost all of it produced by us...