From the BBC (but also covered by CNN, and a few other papers):

Bolivia has launched a diplomatic offensive to try to end an international ban on chewing coca leaf. Foreign Minister David Choquehuanca is on a European tour in a bid to drum up support to amend a UN treaty on banned drugs to decriminalise coca chewing. Coca has been used in the Andes for thousands of years as a mild stimulant and sacred herbal medicine. But it is also the raw material for the production of illegal cocaine, and the US is expected to oppose the move.

There’s a briefing from TNI, and a note from the International Drug Policy Consortium.  A final decision will be made on the amendment on Jan 31st.