Frankincense is in trouble.

It is a cold, damp and dark today - just the sort of day to spend indoors attempting some macro photography. This is a piece of Frankincense, just 5 millimetres in length and so best seen zoomified, from the Souk in Muscat.
Frankincense is an aromatic resin that is tapped from Boswellia sacra trees by slashing the bark and allowing the exuded milky resins to bleed out and to harden. The drops of hardened resin are called tears.
Frankincense is used extensively in religious rituals and by the perfume industry but there are very real fears that production is declining rapidly and that it will probably halve over the next 15 years. The problem is one of over-exploitation and the widespread loss of trees due to the encroachment of agriculture and livestock.