Word: gas
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Dates: during 2000-2009
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...studies of population trends in developed economies have revealed that during economic downturns, mortality rates decline rather than increase. This trend is partly the result of a drop in traffic fatalities - perhaps because rising unemployment means fewer people commute to work or because people are trying to save on gas - but also of less easily explained drops in factors such as cardiovascular and liver disease, influenza and pneumonia. In one groundbreaking study in 2000 on the impact of joblessness, for example, Christopher Ruhm, an economist at the University of North Carolina at Greensboro, examined statewide mortality fluctuations...
...Pretty soon human-caused N2O emissions will be greater than all other ozone-depleting substances combined," says John Daniel, an atmospheric scientist with the National Oceanic and Atmospheric Administration (NOAA) and a co-author of the Science study. "It will be the dominant gas in the future." (See TIME's special report on the environment...
...idea that N2O poses a threat to the ozone layer is not new, but the Science study is the first comprehensive look at the exact concentrations and consequences of the gas. The investigators found that although N2O is only one-sixtieth as dangerous to the ozone layer as CFCs on a gram-by-gram basis, the sheer amount of N2O - each year nearly 1 billion metric tons of CO2 equivalent are released globally - means that it now poses a more significant threat to the atmosphere. (N2O emissions are calculated in terms of their impact on global warming...
...livestock manure, sewage treatment and automobiles. And it's not just our doing: two-thirds of global N2O emissions come from the planet itself, as bacteria in soil and the oceans break down nitrogen. Though N2O is regulated by the Kyoto Protocol of 1997 as a greenhouse gas - and one that is nearly 300 times more potent for global warming than CO2 - that treaty doesn't cover all nations, and will expire in 2012. "The question is how are we going to reduce these gases," says Daniel. "We need to bridge that gap between science and policy." (See pictures...
...less meat-heavy diet and lowering the number of cars on the road while boosting fuel economy will all help. The planet itself will continue churning out its own N2O, of course, but the planet did that for eons. It was our N2O production that pushed the gas past the tipping point - requiring that we now push it back. "It can be a win-win phasing out these gases, both for climate and the ozone," says Robert Portman, an atmospheric scientist at NOAA and a co-author of the study. If we fail, we won't be laughing about nitrous...