SAO PAULO (AP) — As Brazil seeks to boost its environmental credentials by hosting the United Nations’ climate summit, a proposal to build a railway through the Amazon has threatened to tarnish that image amid protests by Indigenous groups and environmentalists. The Ferrograo railway project would transport commodities including corn and soybeans nearly 1,000 kilometers (621 miles) from a city on the southern edge of the rainforest to a port along a major tributary of the Amazon River. From