Scientists say the next decade is crucial for slowing climate change. To catch up, Biden's environmental policies will have to move faster than any in history.
Dozens of cities are vowing to cut their carbon emissions and uphold the U.S. commitment to the Paris climate deal. Despite progress, many are falling short of their most ambitious goals.
Fallout from sexual harassment, Comey's firing and the Mueller probe are all in strong positions to be the top political stories of 2017. Will there be an upset Thursday?