A $40 billion development plan could reduce the size of pristine forest to less than 5%, with 42% of the region either totally deforested or heavily degraded by the year 2020.A new report compiled by scientists from four research centres, and published in 19 January's edition of the journal Science, has painted a grimmer picture of the Brazilian lions share of the world's largest rainforest ecosystem, containing about 40% of world tropical forest.