The median age of the world's population was estimated to be 29.7 years in 2014, and is expected to rise to 37.9 years by 2050. According to the World Health Organization, the global average life expectancy is 70.5 years as of 2012, with women living an average of 73 years and men approximately 68 years.
A grassland is an area of land that mostly contains grasses. There are wild grasses, and less trees. Several parts of the world have grasslands. Grasslands are found in Africa, North America, Central Asia, South America, and near the coasts of Australia. The largest grasslands are in East Africa.Grasslands with a few scattered trees are called savannas.Others are called prairies or steppes.everal parts of the world have grasslands. Grasslands are found in Africa, North America, Central Asia, South America, and near the coasts of Australia. The largest grasslands are in East Africa.
A grassland is deï¬ned as a non-wetland type with at. least 10% vegetation cover, dominated or co-dominated by graminoid and forb. growth forms, and where the trees form a single-layer canopy with either less. than 10% cover and 5 m height (temperate) or less than 40% cover and 8 m. height (tropical).