He and his team studied tree mass, dead wood and soil carbon in twenty-five mangrove ecosystems in the Indian and Pacific Oceans.

VOA: special.2011.05.10

Another says ordinary lightning hits the ground or a tree and dislodges a glowing mass.

BBC: Ball lightning baffles scientists

For about a century now, tree planting has been the mass-participation activity.

BBC: NEWS | Science/Nature | Rolling back Iceland's big desert

Ghattas said that authorities remained hopeful the number of visitor bookings would recover so pilgrims could enjoy the city's planned events, which included a Christmas tree lighting ceremony on December 15, and a choral festival before midnight Mass on Christmas Eve.

CNN: Gaza conflict deters Bethlehem Christmas pilgrims