Word: threshold
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...vaccine that can be submitted for approval for use in the general public, if such a breakthrough occurs at all. Most licensed vaccines have an efficacy rate of at least 70%, although it's possible that an HIV vaccine with lower efficacy may gain approval, Kim says. "The efficacy threshold may be a consideration that is specific to individual countries, the nature of their HIV-AIDS epidemics and the performance characteristics of the vaccine," Kim says...
...good news is that hospitalizations remain an exception for those getting the flu, and deaths of children have been relatively rare - with two or three pediatric deaths being reported each week, below the threshold of a full-blown epidemic. Over the past year, the Centers for Disease Control and Prevention (CDC) has received reports of 117 influenza-related deaths of children, of which 25 occurred in children younger than age 2 and 35 occurred in children ages...
...Obama's attempt to hold Iran to account may disappoint many who have been closely tracking the U.S. effort to back Tehran away from the nuclear threshold - not because the President showed any lack of resolve, but because the resolve of others remains in question. The British and French leaders were adamant in their support, with Sarkozy warning that "if by December there is not an in-depth change by the Iranian leaders," tough new sanctions would be applied. Brown called the new development the greatest challenge facing the international community. But Germany, which has recently shown reticence to expand...
...three of the nine cases Rockstrom has pointed out, however - climate change, the nitrogen cycle and species loss - we've already passed his threshold limits. In the case of global warming, we haven't yet felt the full effects, Rockstrom says, because carbon acts gradually on the climate - but once warming starts, it may prove hard to stop unless we reduce emissions sharply. Ditto for the nitrogen cycle, where industrialized agriculture already has humanity pouring more chemicals into the land and oceans than the planet can process, and for wildlife loss, where we risk biological collapse. "We can say with...
...case - pollution causes cumulative damage, even below the tipping point. By focusing too much on the upper limits, we still risk harming Earth. "Ongoing changes in global chemistry should alarm us about threats to the persistence of life on Earth, whether or not we cross a catastrophic threshold any time soon," writes William Schlesinger, president of the Cary Institute of Ecosystem Studies, in a commentary accompanying the Nature paper...