  We approximate intersection numbers $\big\langle \psi_1^{d_1}\cdots
\psi_n^{d_n}\big\rangle_{g,n}$ on Deligne-Mumford's moduli space
$\overline{\mathcal M}_{g,n}$ of genus $g$ stable complex curves with $n$
marked points by certain closed-form expressions in $d_1,\dots,d_n$.
Conjecturally, these approximations become asymptotically exact uniformly in
$d_i$ when $g\to\infty$ and $n$ remains bounded or grows slowly. In this note
we prove a lower bound for the intersection numbers in terms of the
above-mentioned approximatingexpressions multiplied by an explicit factor
$\lambda(g,n)$, which tends to $1$ when $g\to\infty$ and
$d_1+\dots+d_{n-2}=o(g)$.
