Guardian: Barack Obama comes out top against John McCain on green policy positions. But what about voting records? Here the heavy lifting has been done by Environment America , who have searched back through the past few years of Congressional activity to pick out 22 key environmental votes. How Obama and McCain jumped in each case is revealed below. (For more details, see the fuller summaries here.) Tallying all these up, Environment America have awarded Obama an impressive total score of 86%, …