Los Angeles TimesRio+20 environment conference gearing up in BrazilLos Angeles TimesRIO DE JANEIRO — The United Nations on Monday prepared to launch its biggest conference in history, as delegates from around the world worked on a plan to help lift billions of people out of poverty without exhausting the planet.Rio+20: Earth summit dawns with stormier clouds than in 1992The GuardianCanada needs to show leadership at Earth Summit, Charest saysCBC.caExpectations low for Rio+20 UN development summitEconomic TimesNew York Times -Xinhuaall 1,725 news articles »