The Hurst effect remains unsolved, despite its practical and theoretical importance. Non uniformly mixing dynamical systems produce long range correlations when orbits expend long time near neutral fixed points in overall mixing systems. The simple auto oscillatory Daisyworld model that has been used to explore the importance of the atmosphere—biosphere feedbacks is one example. Depending on the parameters, time series resulting from the numerical integration of these examples exhibit the Hurst effect. We interpret this behavior as a consequence of the existence of fixed neutral points.