What do we use ancient dead seedless plants for in our modern world?

Ancient dead seedless plants, primarily coal and peat, are significant as fossil fuels, providing a vital energy source for electricity generation, heating, and industrial processes. Additionally, they contribute to the production of carbon-based materials, such as plastics and chemicals. Their decomposition over millions of years has also enriched soil, enhancing agriculture. Furthermore, these plants offer insights into Earth's historical climate and ecology, aiding scientific research.