Syria has agreed to surrender its chemical weapons - but how can they all be found and disposed of?
Some butchers are using dangerous chemicals to preserve meat and keep away flies. Formaldehyde, a chemical used to preserve dead bodies in hospitals, is one of the chemicals being used.
The German government says a specialist firm has destroyed 500 tons of chemicals. Observers had feared the material could fall into the hands of terrorists after Moammar Gadhafi's demise and Libya's descent into chaos.
Scientists at NASA have shared evidence proving that levels of ozone-destroying chemicals in the atmosphere are declining. For the first time, there is full scientific proof that a worldwide ban on CFCs is working.
Russia inherited a massive chemical weapons stockpile from the Soviet Union at the end of the Cold War. Its decision to put an end to that deadly legacy has been met with praise.
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