March was quite long, wasn't it? This is a picture of petroleum. Society is in a bit of trouble regarding this magical liquid right now. Before life learned to "digest" dead organic matter, all the dead plankton, algae and other organisms decomposed anaerobically turning into petroleum. This happened 252-66 million years ago. Humans started using petroleum in one form or another at least 4000 years ago, but it wasn't until the 19th century that we started to rely on it so much - first for lighting, then everything else.
By Nefronus - Own work, CC0, https://commons.wikimedia.org/w/index.php?curid=94983250