Joe Biden says he will immediately re-join the Paris agreement on climate change, which Donald Trump withdrew from. Donald Trump has also repealed many of President Obama’s environmental laws. In the meantime, cities and States across the US have been taking their own action on the environment and climate change, irrespective of what’s been happening in Washington. President-elect Biden has said that climate change is the number one issue for humanity and for him. But will he be able to change much? Carlos Watson and Ritula Shah (standing in for Katty Kay this week) speak to Wisconsin’s Lieutenant Governor, Mandela Barnes, about what his state has been doing and what obstacles it faces. They’ll also be speaking to Jody Freeman, professor of environmental law at Harvard, who was an advisor to the Obama administration, about the difficulties Biden could have getting his climate agenda passed. Also taking part will be the mayor of Carmel, Indiana, Jim Brainard, who describes how being a Republican does not conflict with taking action on climate change. Production team: Editor, Penny Murphy. Producers: John Murphy, Luke Radcliff, Maeve McGoran, Iyore Odighizuwa, Jonelle Awomoyi