'Implications are grim': EPA moves to repeal climate change 'holy grail'

This week, the Trump administration moved to eliminate some of the most landmark climate change research on the dangers of greenhouse gases. The so-called endangerment finding has been called the holy grail of climate science and was laid out by the Obama administration in 2009. It's used to set greenhouse gas emissions from cars, factories, power plants, and other sources of climate pollution.This marks the Trump administration's boldest attack yet on climate change regulations. Joining us now, science wri ...