TransCanada's Girling has also argued that if Canadian oil doesn't reach the Gulf through an environmentally friendly buried pipeline, that the alternative is oil that will be brought in by tanker, a mode of transportation that produces higher greenhouse-gas emissions and that puts the environment at greater risk. Diane Francis has argued that much of the opposition to the oil sands actually comes from foreign countries such as Nigeria, Venezuela, and Saudi Arabia, all of whom supply oil to the United States and who could be affected if the price of oil drops due to the new availability of oil from the pipeline. She cited as an example an effort by Saudi Arabia to stop television commercials critical of the Saudi government. TransCanada had said that development of oil sands will expand regardless of whether the crude oil is exported to the United States or alternatively to Asian markets through Enbridge Northern Gateway Pipelines or Kinder Morgan's Trans-Mountain line.