Realizing homology classes by symplectic submanifolds

In this note we prove that a positive multiple of each even-dimensional integral homology class of a compact symplectic manifold $(M^{2n}, \omega)$ can be represented as the difference of the fundamental classes of two symplectic submanifolds in $(M^{2n}, \omega)$. We also discuss the realizability of integral homology classes by symplectic surfaces in $(M^{2n}, \omega)$.