This article says how Catholics must cooperate with other Christians and with non-Christians, locally, nationally and internationally - in the support of basic human values

Such a teaching is a far cry from previous centuries when such cooperation was outlawed

Ecumenism....yes indeed, one of the fruits of Vatican II
for which we must continually say

Thank you Lord!

At the same time hoping and praying that the present-day ecumenical winter of decreased interest and commitment will not last (c.f. this article)