Why welcoming policies may be needed:
Scientific American blog on the “chilly climate” for women in science.
Compilation of references on the chilly climate for women in academia.
How to improve the climate for women in academia:
Best practices for improving the climate in departments (aimed at physics, but more generally applicable).
Programs in Mathematics that Make a Difference (awarded by the AMS).
Exemplary Mathematics Departments (awarded by the AMS).
Incremental change in the field of philosophy.
Examples of policies:
AMATYC’s welcoming environment policy
Anti-Harassment Policy of the American Astronomical Society.