BostonGlobe.com Political Headlines - August 3, 2012

Here are the top POLITICAL headlines from BostonGlobe.com today: 

• Brown, Warren split on environmental policies:US Senator Scott Brown, who says he regrets having supported the region's effort to cut greenhouse gases, has dismayed environmental advocates, who have turned to Elizabeth Warren. Environmental reporter David Abel details.

• Romney's culture remark offers peek at worldview: Mitt Romney triggered a firestorm this week when he said that some economies are more vibrant than their neighbors because of their cultures. Political reporter Matt Viser describes.   

• 'You didn't build that' comment becomes flashpoint in Brown-Warren race:President Obama's controversial comment highlights a philosophical divide in the pivotal Senate race. Political reporter and Boston.com politics editor Glen Johnson covers.    

• Researchers fear wallop of mandated budget cuts: Worried researchers are leaving laboratories to roam the halls of Washington to fight cuts they contend will set back research on diseases like cancer and Alzheimer's.  Globe political reporter Bobby Caina Calvan details.