On Earth Day, Joe Biden announced the US’ ambitious goal to cut greenhouse gas emissions in half by 2030. But it seems like the calculations that guided the administration’s decision are a secret. Today, POLITICO’s Zack Colman, on why Congress and the private sector want to know the math behind the White House’s climate plan. Zack Colman is an energy reporter for POLITICO. Anthony Adragna is an energy reporter for POLITICO and host of POLITICO Energy. Carlos Prieto is a Politico podcast producer. Jenny Ament is the senior producer of POLITICO audio. Irene Noguchi is the executive producer of POLITICO audio.