nitrogen, potassium, phosphorus. there will be a three number ratio, the ratio of those three elements. he is one of the ones that encourages us to think of fertilizer as more like vitamins then food. the humus theory saw soil as something that needed to be fed. but no, it needed in fusions of these chemical, mineral elements. nitrogen would be the trickiest one. but as luck would have it, just as liebig was writing his major treatise on the subject in 1840, and industry was beginning to capitalize on a remarkable new sort of concentrated, mineable, nitrogen, that came from an unlikely, remote place. these islands called the chincha islands. anyone know where these islands are? >> i would like to ask where these islands are located? [laughter] prof. sutter: anyone know? >> they're located off the coast of peru. prof. sutter: i will show you a map later. it is a very small island, three of them granite, off the coast of southwest peru. best known as hosts for massive colonies of sea birds, cormorants, pelicans, who wo

calm water that's suddenly warmed in bright sunlight or when there's an excess of nutrients like phosphorus or nitrogen. >> there's always algae in, you know, most lakes. but why it turns toxic is a bit of a mystery. >> reporter: the district is studying the problem trying to find an environmentally safeway to get rid of the bacteria. that may mean treating with chemicals or installing large pumps acting as fountains in the middle of the lake to keep the water moving. meanwhile, folks are still enjoying the beach. >> we'll still enjoy the beautiful scenery. but unfortunately we won't be able to get in the water today. >> reporter: the park district hopes it clears up before the upcoming 4th of july weekend but don't hold your breath or -- maybe this close perhaps i should. in oakland, don ford, kpix 5. >> although swimming is prohibited, fishing is still allowed at the lake. >>> crews are cleaning up after a brush fire that broke out on highway 17 near the santa cruz mountains started yesterday after a car caught fire along the highway. one lane of southbound 17 was closed. most of the afte

push to recapture fallujah involved the extensive use of depleted uranium and white phosphorus, leaving a legacy of birth defects that continues today. the organization of american states has announced it will hold an emergency meeting to discuss whether to suspend venezuela for violating the oas charter. oas secretary-general said tuesday venezuela had suffered " grave alterations of democratic order" but supporters of the venezuelan president nicolas maduro have criticized the oas for targeting venezuela, not brazil, or the democratically elected president dilma rousseff was recently removed from power in what many have described as a coup. president maduro has criticized oas for intervening in venezuelan politics and also criticize the u.s. legal system and voiced support for democratic presidential candidate bernie sanders. elections were free, they would not depend on an archaic system that is 200 years old and bernie sanders would be president of the united states. amy: we will be speaking to the venezuelan ambassador to the oas later in the broadcast. california governor jerry br