Montana trial tests state's duty to protect environment in youth climate lawsuit.

A lawsuit brought by a group of young plaintiffs against the state of Montana over its duty to protect the environment heads to trial on Monday. The case centers on whether a constitutional right to a livable climate is protected by state law and has the potential to set an important precedent in the fight against climate change. The outcome of the trial could send a powerful message to other states, but even if the plaintiffs prevail, it is unlikely to lead to immediate policy changes in fossil fuel-friendly Montana.