Uber CEO Travis Kalanick's 'ask for forgiveness, not permission' leadership style set a tone that appears to have infiltrated the entire company and drawn criticism from the outside. Recently, Uber has tried to reverse course by playing the humility game. Is it working?
Trump appeared this week with Transportation Secretary Elaine Chao, General Motors CEO Mary Barra, and many other auto-industry executives at the American Center for Mobility in Ypsilanti, Mich. Here's what he did and didn't say about auto emissions rules.
The aviation industry accounts for around 2 percent of global carbon emissions, and that could could triple by the middle of the century. One study proposes replacing jet fuel with liquid hydrogen, a much lighter fuel.