Video of the Week: Climate change has a controversial history

Prior to the late 1800's, people believed the Earth's climate was static and never changing, and it wasn't until a few scientists in the second half of the 19th century began to wonder how giant boulders were in places where they shouldn't be. Today, 98 percent of climate scientists agree additional greenhouse gases from burning fossil fuels is the primary reason for the current accelerated warming of the planet.