They found that over a period of six years, planting three rows of trees reduced total dust and ammonia by more than half.

VOA: special.2009.09.08

The total amount of activity should be spread over at least three days throughout the week.

VOA: special.2010.06.08

The world's total forest area is just over four billion hectares.

VOA: special.2010.04.06

In total,he found twenty-two echidnas over five years.

VOA: special.2009.07.07

"Since January, a total of 924 boats and over 46,700 people have made the journey to Yemen from the Horn of Africa.

VOA: standard.2009.09.26

By linking the goal to its gross national product rather than setting an absolute emissions target, China - the world's largest emitter of greenhouse gases may actually see its total emissions increase over the next decade, even if it meets the voluntary target.

VOA: standard.2009.11.26