The terrestrial ecosystems of North America have been identified as a sink of atmospheric CO<Subscript>2</Subscript> though there is no consensus on the magnitude. However, the emissions of non-CO<Subscript>2</Subscript> greenhouse gases (CH<Subscript>4</Subscript> and N<Subscript>2</Subscript>O) may offset or even overturn the climate cooling effect induced by the CO<Subscript>2</Subscript> sink. Using a...</subscript></subscript></subscript></subscript></subscript>

Drought is one of the most devastating natural hazards faced by the Southern United States (SUS). Drought events and their adverse impacts on the economy, society and environment have been extensively reported during 1895–2007. Our aim is thus to characterize drought conditions in the SUS and...