Brazil has made a dramatic increase in the rate of deforestation . Environmentalists worry that its progress could be put at risk by changes to forest law . Studies by South Dakota State University and the environmental think tank World Resources Institute show that the lowlands of Kalimantan and Sumatra have lost more than 40 % of the rainforest cover since 1990 . Greenpeace is also concerned that Brazil 's measures to halt logging are not working . The World Resources Institute says the world needs consistent , real - time deforestation data .
Brazil has made a dramatic increase in the rate of deforestation . Environmentalists worry that its progress could be put at risk by changes to forest law . Greenpeace is also concerned that Brazil 's measures to halt logging are not working . The World Resources Institute says the world needs consistent , real - time deforestation data .