The Keystone XL pipeline is at issue once again, this time in a South Dakota courtroom. Opponents filed an appeal in 2016 after the Public Utilities Commission gave the go-ahead for the pipeline the previous year. On Wednesday in Pierre, a Sixth Circuit judge heard oral arguments in the case.
Opponents say the PUC didn't do its job to ensure that TransCanada can build a safe pipeline.
But the PUC and TransCanada say the outcome followed state law.
SDPB's Victoria Wicks traveled to Pierre to get this report.