Renewed threat from chemical, biological weapons

In April, Syrian President Bashar al-Assad's air force dropped bombs containing sarin nerve gas on a rebel area in northern Syria. Around 100 people were killed and hundreds more injured, including a number of children.

The slaughter highlighted the renewed threat of chemical and biological weapons. Both Assad's forces and rebel groups have used chemical weapons in Syria, demonstrating the dangers of proliferation. Meanwhile new gene editing technologies allow for the creation of more virulent and deadly bioweapons.

On this edition of Global Journalist, a look at the history and future of chemical and biological weapons.

 Joining the program:

• Daniel Gerstein, a senior policy researcher at the Rand Corp.
• Edward Spiers, professor of strategic studies at the University of Leeds.
• Sarah Everts, a senior editor at Chemical & Engineering News.
• Leonard Cole, director of the Program on Terror Medicine at Rutgers-New Jersey Medical School.