Natural gas (methane (CH4)) is the cleanest burning fuel<span>, emitting the smallest amount of carbon dioxide of all the </span>fossil fuels<span> (coal, oil and natural gas).</span>
Carbon dating is a process that estimates the age of anything. However, there are flaws that exist. It may not be a precise number, but it does gives a good estimation.
That would be coal because you can cook with coal, build things out of coal, and use it for energy
