Global warming experiment turns up the heat in Puerto Rican forest

A pioneering research project is aiming to determine how forests in the Amazon, the Congo and elsewhere in the tropics will reacting to rising temperaturesMid-morning in the Luquillo experimental forest in north-west Puerto Rico, and the thermometer already reads 26C. Tana Wood, an ecologist employed by the US Forest Service, pulls on a pair of heavy gloves for insulating against electrical shock. Over two years, her team here has laid out hexagonal plots four metres across, each about the size