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.
Unlike other male versions of the pill currently on the drawing board, which block the action of the male hormone testosterone on the sperm-producing cells within the testicles, the new birth-control method would maintain normal sperm production.