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Speech problems , hyperactivity , attention problems , seizures , and mental retardation are also somewhat more common and may contribute to the learning problems . " Reneging on one of his campaign promises , the Bush Administration refused to cut down on carbon dioxide emissions , which contribute to global warming , from power plants . Quick access to categories , such as crime agencies , and a keyword search engine allowing precise searches ( e.g ., " capital punishment " ) are provided . The Journal of Chinese Overseas carries research articles , reports and book reviews on Chinese overseas throughout the world , and the communities from which they trace their origins . New digital technologies are producing higher resolution micrographs , but the quality still falls short of that obtainable with film .