The Brazilian government may implement a 20% tax on ethanol imports, marking a return to a measure last used in 2010 to protect domestic industry. That follows a 16% rise in import shipments in the past six months on a year earlier, with shipments from the U.S. jumping 38%. U.S. producers have been increasingly reliant on Brazil, which represented 39% of total U.S. ethanol exports in the past quarter vs. 20% a year earlier. A tax in Brazil would be a second blow for the industry, which recently also suffered anti-dumping duties on exports of distillers’ grains – an ethanol by-product – i...