Norwegian oil and gas firm Aker BP on Tuesday announced the start of oil production from the Tyrving development, while the Norwegian government is testifying at an appeals court this week to overturn a lower court ruling that Norway failed to consider the environmental impact of the project when it approved it. Early this year, the Oslo District Court ruled that the government’s approval of three new oil and gas fields, Breidablikk, Yggdrasil, and Tyrving, all in the North Sea, was invalid as it failed to take into account the emissions…