Environment
Growth of Ethanol Fuel Stalls in Brazil
The nation's shortages are a sobering lesson for a biofuels pioneer
Stories by Claudio Angelo
Environment
Airborne Analysis of Burning Amazon Forests Could Close Climate Model Gaps
The goal is to understand how burning biomass in South America is affecting local weather and air quality
The Sciences
Q&A With Iconoclast Who Makes First Contact With Amazonian Tribes
Sydney Possuelo is among the last, and certainly the most famous, of the sertanistas —men who make a living by conducting dangerous first-contact missions with remote indigenous peoples of the Amazon...
Evolution
Prime Directive for the Last Americans
Saving Amazonia's indigenous peoples means not meeting them, insists Sydney Possuelo--a policy of noninterference he hopes to extend, even if others hate it
Environment
Punctuated Disequilibrium
Occasional but extreme climate could turn parts of the Amazon rain forest into dry savannas
