LONDON - The U.N. Population Fund has declared that having fewer children would help reduce so-called global warming...but added it is difficult to proof a connection between the two.

The agency said the battle against global warming could be helped if the world slowed population growth by making free condoms and family planning advice more widely available.

The agency did not recommend countries set limits on how many children people should have, but said: "Women with access to reproductive health services ... have lower fertility rates that contribute to slower growth in greenhouse gas emissions"...