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.
All grasslands share several common traits. 1  In general, the term grassland refers to land which: 2  is dominated by grasses; 3  occurs on flat or rolling terrain; 4  has similar soils (alkaline, lots of organic matter, very fertile, and fine-grained); 5  has soil that is almost completely covered by vegetation;