SAO PAULO, Dec 13 (Reuters) - Deforestation in the world's most biologically diverse savanna, the Brazilian Cerrado, rose by around 25% in the 12 months through July from the previous period, two people familiar with the still unreleased government data told Reuters.Bustamante said the policies of outgoing President Jair Bolsonaro to weaken environmental protections had contributed to more destruction in the Cerrado, as in the Amazon rainforest.President-elect Luiz Inacio Lula da Silva, who takes office on Jan. 1, has pledged to end deforestation in the country by 2030, with plans to reverse Bolsonaro's policies and strengthen environmental law enforcement.FARM-DRIVEN DEFORESTATIONThe Brazilian savanna is now a major concern for top grains traders, who have broadly pledged to eliminate deforestation from their supply chains by 2025."Consumers of agricultural products, especially beef and soy, have a lot of difficulty knowing the origin of their products," said Yuri Salmona, director of the Brazilian non-profit Cerrados Institute."