Popular nutrition Any of a number of weight-reduction diets that either eliminate one or more of the essential food groups, or recommend consumption of one type of food in excess at the expense of other foods; FDs rarely follow modern principles for losing weight. See Diet.
Early Modern Homo sapiens. All people today are classified as Homo sapiens. Our species of humans first began to evolve nearly 200,000 years ago in association with technologies not unlike those of the early Neandertals. It is now clear that early Homo sapiens, or modern humans, did not come after the Neandertals but were their contemporaries.
Some argue that humans began changing the global environment about 50,000 years back, in the Pleistocene epoch, helping along if not outright causing the mass extinctions of megafauna, from mammoths to giant kangaroos, on most continents. Others date it to the emergence of agriculture some 7,000 years ago.he beginnings of burning fossil fuels to power machines in the 19th century initiated a change in the mix of atmospheric gases, and the first nuclear weapon test on July 16, 1945, spread unique isotopes across the globe.