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To be sure , it remains essential to reduce greenhouse gas emissions by strengthening the Kyoto Protocol and augmenting it with other measures . As the hypothesis explored in Consciousness and Neuroscience pertained to a more localized concept of NCC it now seems essential to mention the alternate theory of a more global and distributive theory of the conscious mind ( 1 ) . But if you are going to deliver TCF effectively , it seems essential that you can measure the extent to which you have , and where you have not . It covers essential content knowledge , theory and themes in educational history , sociology , and philosophy . However , as teachers strive to implement collaborative learning strategies and to meet the needs of diverse learners , an overview of the various arguments and research about ability grouping seems essential . Yet a network-centric approach based on a jointly developed network architecture remains essential if we are to field forces that can ( 1 ) respond quickly to a wide range of contingency demands and ( 2 ) act decisively from the outset against adaptive and resourceful adversaries . Immigration today remains essential to the basic goals of offering a haven for refugees and reuniting families . It discusses alternatives to their use and clarifies essential behavior for elements that cannot currently avoid them . The Alternative Group Planis a health benefit plan that covers essential services . Finally , arresting and even reversing the spread of nuclear weapons remains essential to U.S. national security . It summarizes , illustrates , and verifies essential findings about basic real-time scheduling algorithms such as earliest-deadline-first , least-laxity-first , and rate-monotonic scheduling for both sporadic and periodic processes .