Images of the cultivation and trade of açai, the trendy "superfood" produced 90% in the state of Pará in the Brazilian Amazon. Açai, which became internationally famous during the 2000s for its nutritional and antioxidant properties, has unleashed an economic boom for traditional farmers in the Amazon region, and been lauded as a way to bring "green development" to the rainforest without destroying it. But experts say it is also threatening the Amazon's biodiversity, as single-crop fields of acai palms become increasingly common. STOCKSHOTS