London / AFP A fifth of the world’s plant species are at risk of extinction, British researchers warned on Tuesday in an unprecedented global census of the plant kingdom. The survey by Britain’s Royal Botanic Gardens at Kew, London, said 21 percent of species are under threat. The report, the first of its kind, is intended to become a ...

  Washington / AFP Several massive tornadoes churned above Oklahoma, killing at least two people, with hail as big as grapefruit hitting the US state, the authorities and US media said. The storms began forming in southern parts of the state in the afternoon, local media reported, with the first confirmed twister hitting near Elmore City, in rural Garvin County. ...

  Brasília / AFP The impeachment of Brazil’s President Dilma Rousseff looked set to go ahead on Tuesday, after the interim speaker of the lower house said he had reversed his earlier annulment. In the latest twist to the country’s spirling political crisis, local media said Waldir Maranhao had “reversed the decision” to cancel the April vote by lawmakers that ...