This week the United States will decide whether it will build a controversial oil pipeline from Canada to Texas. The pipeline, which will cost 7 billion dollars, will ensure the transportation of oil gained from Canadian tar sands to the United States. Proponents emphasize the need of energy supplied by a friendly neighboring country instead of the hostile Middle East. Opponents see great risks to the environment and would prefer investing in renewable energy. A debate followed on PBS between pipeline proponent Robert Bryce and environmentalist Bill McKibben.