If you look at what we've done to date, we've nearly doubled our investments in chemical and biological defenses. We've implemented any number of important organizational changes to address the challenges that are posed by WMD more effectively.

We have no such weapons at all, no chemical weapons, no biological weapons.

Our base line is more difficult (for chemical and biological),

My suspicions are that we'll find [things] in the chemical and biological areas. In fact, I think there may be some surprises coming rather quickly in that area.

Environmental Sustainability – A way of using natural recourses, in such a manner, that when they become useless, they become part of environment (bio degradable) without making any physical, chemical or biological change to the environment in short and/or long run. Anuroop Tyagi

One letter to bin Laden reveals that al Qaeda was working on chemical and biological weapons in Iran.