President Joe Biden entered the White House with a climate agenda that was the most ambitious in history. But a year later, the president is struggling to notch major wins and his progressive base is losing patience. POLITICO’s Josh Siegel reports.    Kelsey Tamborrino is a reporter covering clean energy and is the host of the POLITICO Energy podcast.  Josh Siegel is an energy reporter for POLITICO.  Nirmal Mulaikal is a POLITICO audio host-producer.  Carlos Prieto is an audio producer for POLITICO.  Raghu Manavalan is a senior editor for POLITICO audio. Jenny Ament is the interim executive producer of POLITICO’s audio department.