Was Crocodile stronger at Marineford? Or was he holding back in Alabasta?

 During the Alabasta arc, Crocodile displayed a level of power that was initially considered overwhelming by the Straw Hat Pirates. He possessed the Logia-type Devil Fruit called the Suna Suna no Mi (Sand-Sand Fruit), which granted him the ability to control and transform into sand. He had a reputation as a Shichibukai and controlled the desert kingdom of Alabasta from the shadows. His strength was showcased through his battles with Luffy and others. At Marineford, Crocodile was present as part of the war that took place at Marine Headquarters. While he did participate in the battle, he didn't display the same level of dominance as some other powerful characters present. This has led fans to speculate that he might not have been as strong as initially portrayed in Alabasta. It's important to note that power scaling and character abilities can be subject to interpretation and development by the author. Oda often keeps details deliberately open-ended to keep the story intriguing.

What is the role of natural gas in America's fossil fuel mix?

 Natural gas is a fossil fuel that is commonly used as a source of energy in the United States. It is formed over millions of years from the decomposition of organic matter and is found in underground reservoirs, often in conjunction with oil.

In the United States, natural gas plays a significant role in the country's energy mix. It is the second-most commonly used fossil fuel in the country, after coal, and is used to generate electricity, heat buildings, and fuel vehicles.

According to the U.S. Energy Information Administration (EIA), natural gas accounted for approximately 30% of the total energy consumed in the United States in 2020. This is down from a peak of 35% in 2016, as the use of natural gas has declined in recent years due to the increased use of renewable energy sources such as wind and solar.

Overall, natural gas is an important component of America's fossil fuel mix and is widely used as a source of energy in the country.