Politics Study says Obama's worst Keystone XL fears could come true

A new study suggests that the Keystone XL pipeline could significantly increase carbon dioxide emissions. President Obama says he won't approve the pipeline if it feeds climate change. But the study's calculations are up for dispute.

By , Staff writer

Nati Harnik/AP/File

President Obama is on the record stating he would approve the Keystone XL pipeline from Canada to the American Gulf Coast only if it did not significantly exacerbate climate change. Now, a new study is saying it could potentially do precisely that.