drainage
works, and land-cover and land-use change.
Two other (sometimes indistinguishable)
challenges to stationarity have been exter-
nally forced, natural climate changes and
low-frequency, internal variability (e.g., the
Atlantic multidecadal oscillation) enhanced
by the slow dynamics of the oceans and ice
sheets (2,
3). Planners have tools to adjust
their analyses for known human distur-
bances
/media/loftslag/Milly_etal-2008-Stationarity-dead-Science.pdf