Latin American Herald Tribune: The adoption of sugar-based ethanol as a substitute for gasoline can reduce up to 73 percent of carbon-dioxide and nitrous-oxide emissions, according to a study by the Brazilian government cited Tuesday in the business daily Valor. The document, drafted by the state-funded Embrapa research outfit, points out that emissions of those two greenhouse gases are thought to be a major factor in global warming. The study considers not only vehicle emissions but the entire process of …