December 5, 2018, 1:45 p.m. by Matt Hickman
The move, the largest of its kind for an American city, could lower emissions and encourage public transit.
In the Green Room: Greg Gumbel on how the NFL is going green
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Video: Chuck Leavell talks to CBS sportscaster Greg Gumbel about how the NFL is going green.
Video: High school students build eco-friendly car
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A group of high school students from Philadelphia is on a mission to prove that it doesn't take an automotive giant to build a fuel-efficient car.
As baby boomers retire, millennials fill the gap
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13 optical illusions that will blow your mind
In 1972, a computer model predicted the end of the world — and we're on track
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5 brilliant mathematicians and their impact on the modern world