Bloomberg: President George W. Bush plans to outline his principles on climate change tomorrow as he and lawmakers wrangle over proposals to cut greenhouse gas emissions, administration spokeswoman Dana Perino said. In a speech scheduled for 2:45 p.m. Washington time, Bush “is not going to lay out a specific proposal,” Perino said. Instead he will set out “realistic” goals for reducing pollution that many scientists say is contributing to global warming, she said. The president …