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#### Abrupt vegetation collapse in North Africa during the Holocene

Liu et al. (2006), following Brovkin et al. (1998), proposed a conceptual climate-vegetation model to study the relative importance of different processes which may have taken part in the abrupt vegetation collapse in North Africa during the Holocene.

Vegetation cover and precipitation as a function of time
 stochastic forcing high frequency stochastic forcing low frequency stochastic forcing $D_B$

Changing the parameters may lead to a small time delay before the figures adjust to the new values.