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Source: flickr/ Christopher Caldwell

Erratic weather behavior and atmospheric carbon dioxide levels in the at a new critical milestone of 400 parts per million have environmentalists arguing against President Obama's "all of the above" strategy. National Journal recently ran a piece detailing DOE Secretary Ernest Moniz's efforts to defend the policy and clarify the objects of the strategy. 

Environmentalists aren't satisfied with using another fossil fuel, natural gas, as a coal substitute for energy generation, and they want a strong push toward a zero-carbon solution. While there have been huge strides in wind and solar energy, we're still in the first inning of carbon reduction, and if we're ever to reach an energy portfolio levered to green energy, natural gas is the only option to get us there.  

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

Alison Southwick and Joel South have no position in any stocks mentioned. Taylor Muckerman owns shares of SolarCity. The Motley Fool recommends and owns shares of SolarCity. Try any of our Foolish newsletter services free for 30 days. We Fools don't 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.