  In all dimensions, infinite-range Kawasaki spin exchange in a quenched Ising
model leads to an asymptotic length-scale $L \sim (\rho t)^{1/2} \sim t^{1/3}$
at $T=0$ because the kinetic coefficient is renormalized by the broken-bond
density, $\rho \sim L^{-1}$. For $T>0$, activated kinetics recovers the
standard asymptotic growth-law, $L \sim t^{1/2}$. However, at all temperatures,
infinite-range energy-transport is allowed by the spin-exchange dynamics. A
better implementation of global conservation, the microcanonical Creutz
algorithm, is well behaved and exhibits the standard non-conserved growth law,
$L \sim t^{1/2}$, at all temperatures.
