Cairns, John Jr.2014-01-232014-01-232011http://hdl.handle.net/10919/24998The tale of the sword of Damocles can be used to describe the sword hanging by a thread over humankind with the damage it is doing to the present biosphere. The sixth biosphere, or the current biosphere, is experiencing a significant reduction in species caused by human-related activities. The signs of risk have markedly increased by the signs differ considerably from one are to another, and people tend do discount global change because it is unnoticeable in their local area. If humans begin to nurture their present biosphere, they could prolong the life of the biosphere and delay a major extinction of a mass amount of species.en-USIn Copyrightclimate changeSustainabilityevolutionglobal warmingPresentationhttp://www.johncairns.net/Papers/Sword.ppt