TransCanada, owners of the proposed Keystone XL pipeline, promised Nebraska state legislators this week to take additional steps to protect environmental safety if the project is approved by the federal government. The Canadian pipeline company made several guarantees to Nebraska lawmakers, including a $100 million bond to ensure adequate funds to clean up after any oil spills, as the state’s legislature considered holding a special session to consider legislation to force the company to change Keystone’s route… In a letter to the Speaker of the Nebraska legislature, Sen.