A new study in the journal Nature offers that for the first time scientists have directly observed an increase in one major greenhouse gas at Earth's surface. "Numerous studies show rising atmospheric CO2 concentrations, but our study provides the critical link between those concentrations and ... the greenhouse effect," said lead author Daniel Feldman.
John Boehner must deal with tea partiers who voted against his reelection as Speaker of the House. Secretary of State John Kerry has to be jet-lagged and sleep-deprived as he commutes from one intractable world crisis to another. At the moment, however, no job in government is more challenging than the one that belongs to Todd Stern, America's chief climate negotiator.