Four decades ago, he spoke out bravely against the Vietnam War. Will he show the same courage today, in helping to end the fossil-fuel era?
How we subsidize energy giants to wreck the planet, and what we can do about it.
The last days of winter and the first days of spring have seen hundreds of record-breaking high temperatures. Worry.
Do the president's campaign e-mails and leadership style in general betray the heavy hand of big oil on his administration?