Why are fossilized seedless vascular plants that died millions of years ago important to humans?

Fossilized seedless vascular plants, such as ferns and horsetails, are crucial to humans as they contribute significantly to our understanding of Earth's historical climate and ecosystems. These plants played a key role in forming coal deposits, which are vital energy sources today. Additionally, studying their fossils helps scientists understand plant evolution and biodiversity, providing insights into current ecological challenges and conservation efforts. Their remains also enrich soil quality, supporting agriculture and natural ecosystems.