BP has sold its onshore wind power business in the United States. The news comes amid a steady flow of reports that both wind and solar companies are in major trouble, thanks to President Trump’s energy agenda and a small but meaningful Republican majority in Congress. It is the latest in a string of developments that raise questions about the financial sustainability of transition energy projects. For BP, the move represents another step away from wind and solar and back to oil and gas, as indicated by the company’s senior management…