Democratic Republic of Congo's environment minister said on Thursday the country intends to ban all log exports and implement other measures to lessen threats to its carbon-absorbing tropical rainforest, a major bulwark against climate change.  Home to a majority of the world's second-largest rainforest, Congo is under pressure to improve forest management and curb a high deforestation rate that has doubled in the last decade, according to U.N. figures.  Environment Minister Eve Bazaiba announced the suspension of log exports to reporters in the capital Kinshasa, but did not say when it ...