  We revisit the old problem of the energy-momentum tensor in general
relativistic field theories. On the basis of the general covariance we derive a
simple equation for the Hilbert and Noether energy-momentum tensors for the
scalar and electromagnetic field theories. We see that the two definitions of
energy-momentum tensors coincide and identify the Noether current if the
space-time has the Killing vector. Relation to the Wald entropy is also briefly
discussed.
