This segment is from Tuesday's edition of "Digging for Value", in which sector analysts Joel South and Taylor Muckerman discuss energy & materials news with host Alison Southwick. The twice-weekly show can be viewed on Tuesdays & Thursdays. It can also be found on Twitter, along with our extended coverage of the energy & materials sectors @TMFEnergy.

Thanks in large part to the cheap price of natural gas in 2012, the United States was able to reduce its carbon emissions to levels not seen since 1994. Unfortunately, countries like China and India have continued to rely heavily on coal to generate the power necessary to sustain the growth each country has been experiencing. While this might not be the best news for global air quality, it is important to note for investors that Arch Coal (NYSE:ACI) and Peabody Energy (NYSE:BTU) continue to increase their export capacity out of terminals such as those owned by Houston-based Kinder Morgan Energy Partners (NYSE:KMP). For more on this continued trend in America, tune in to our show below.

Natural gas has been influencing myriad industries, including transportation 

Joel South has no position in any stocks mentioned. Taylor Muckerman has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.