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.
The cervical cap prevents pregnancy by keeping sperm from joining with an egg. In order to be as effective as possible, the cervical cap must be used with spermicide cream or jelly. The cap works in two ways: The cervical cap blocks the opening to the uterus.