Materials, products and services - the Green Guide Online provides details of the life cycle environmental impacts of construction materials and components, and the Green Book is a free online database of products and services.
Spermicides are used globally for birth control, with or without condoms. As the only means of birth control, spermicides are rarely effective. However, in conjunction with condoms, spermicides are somewhat effective in birth control.
Spermicide has to be inserted deep into the vagina before having sex. The spermicide forms a barrier that blocks the cervix, the entrance to the uterus. It can stop sperm from swimming, so they cannot fertilize an egg. Spermicide also helps to prevent pregnancy by killing sperm.