Golly none? In the past 5 years alone, the GTN pipeline you claim as a flawless example has had three incidents, totaling over $1.14 million in property damage and an value of ~$380k in product spilled: https://goo.gl/LgZ3ao

Using the highest industrial price of $5.62 per mill Btu during those five years, $380k = 67,616,000,000 Btu. There are ~102,000 Btu per 1 Ccf, and 1 Ccf is about 748 U.S. liquid gallons. That $380k was roughly 495,885,135 gallons of spilled product. Care yet? 

The operator information there doesn't even include "all" incidents, as operators are only required (under 49 CFR 191)  to report incidents that involve death or serious injury, property damage of $50k or more, a gas loss of $50k or more, and/or an unestimated gas loss of 3 million Ccf or more. Maybe if this "small" leak happened on your property you'd care? https://goo.gl/UJ3XKw 

FUN FACT: Still counts as a disaster/having a negative environmental impacts, even if you don't think it affects you.