Agence France-Presse: US senators on Wednesday unveiled a long-awaited plan on climate change, proposing to cut emissions 17 percent by 2020 off 2005 levels through regulation of power, industry and transportation. “We can finally tell the world that America is ready to take back our role as the world’s clean energy leader,” said Senator John Kerry, a Democrat from Massachusetts and close ally of President Barack Obama. After months of fine-tuning, Kerry and independent Senator Joe Lieberman …