Solar water disinfection (SODIS) involves exposing water-filled plastic polyethylene terephthalate (PET) bottles to sunlight for several hours. Exposure times vary depending on weather and climate from a minimum of six hours to two days during fully overcast conditions. It is recommended by the World Health Organization as a viable method for household water treatment and safe storage. Over two million people in developing countries use this method for their daily drinking water.
Solar water disinfection is recommended by which organization?
the World Health Organization

The ecclesiastical structure of the Roman Empire survived the movements and invasions in the west mostly intact, but the papacy was little regarded, and few of the western bishops looked to the bishop of Rome for religious or political leadership. Many of the popes prior to 750 were more concerned with Byzantine affairs and eastern theological controversies. The register, or archived copies of the letters, of Pope Gregory the Great (pope 590604) survived, and of those more than 850 letters, the vast majority were concerned with affairs in Italy or Constantinople. The only part of Western Europe where the papacy had influence was Britain, where Gregory had sent the Gregorian mission in 597 to convert the Anglo-Saxons to Christianity. Irish missionaries were most active in Western Europe between the 5th and the 7th centuries, going first to England and Scotland and then on to the continent. Under such monks as Columba (d. 597) and Columbanus (d. 615), they founded monasteries, taught in Latin and Greek, and authored secular and religious works.
In what region of Western Europe did the pope have influence?
Britain

After the Nixon administration, advancements in affirmative action became less prevalent. "During the brief Ford administration, affirmative action took a back seat, while enforcement stumbled along.":145 Equal rights was still an important subject to many Americans, yet the world was changing and new issues were being raised. People began to look at affirmative action as a glorified issue of the past and now there were other areas that needed focus. "Of all the triumphs that have marked this as America's Century ...none is more inspiring, if incomplete, than our pursuit of racial justice."
Which administration allowed affirmative action to take a backseat to other issues?
Ford