  The maximum average degree $\mathrm{mad}(G)$ of a graph $G$ is the maximum
average degree over all subgraphs of $G$. In this paper we prove that for every
$G$ and positive integer $k$ such that $\mathrm{mad}(G) \ge k$ there exists $S
\subseteq V(G)$ such that $\mathrm{mad}(G - S) \le \mathrm{mad}(G) - k$ and
$G[S]$ is $(k-1)$-degenerate. Moreover, such $S$ can be computed in polynomial
time. In particular there exists an independent set $I$ in $G$ such that
$\mathrm{mad}(G-I) \le \mathrm{mad}(G)-1$ and an induced forest $F$ such that
$\mathrm{mad}(G-F) \le \mathrm{mad}(G) - 2$.
