After a bruising election that former President Donald Trump and his allies attempted to overturn, Joe Biden was sworn in last week as the 46th president of the United States, wrapping up one of the most dramatic political transitions in American history.
Now the real work begins for the 78-year-old Democrat, who faces the world's worst COVID-19 pandemic, deepening domestic political fissures, fractured international relations and the need to make up for four years of lost time in responding to the global climate crisis.
