With oil becoming more expensive worldwide, old-fashioned coal is looking better to some nations, especially in Europe but even in the United States.
One reason is the US is known for its abundance of coal, with some people calling it "the Saudi Arabia of Coal."
Climate Depot's Marc Murano says coal gained a bad reputation over the past few years in the US and Europe because it's a major source of pollution where it's heavily burned to create electricity and for industrial use, but certain Asian nations that claim to be big on clean energy are actually polluting the air with lots of it.
"We walked away from coal because of climate concerns, and this began way back in the Obama administration, but guess what? China burns more coal than the rest of the world combined."
And in a time of war such as the conflicts in Ukraine and Iran, coal is of great strategic value, especially when faced with rising coal prices.
"The United States produces more of its own coal and we can do it cheaply, it keeps costs down and its not a global market, so we don't have to worry about the global price of coal the way we worry about the global price of oil.
"Coal is the most strategic energy source you can have, it is your greatest national security asset in a time of conflict."