लहान ओल्या वनस्पतींपासून विशाल जंगलांपर्यंत: झाडांनी पृथ्वी कशी बदलली

More than 3 billion years ago, Earth was very different. There were no forests, no grass, no flowers, and no animals walking on land. Life existed only in oceans. The land was mostly empty rock — dry, hot during the day, cold at night, and filled with dangerous ultraviolet radiation from the Sun.

Timeline of how plants changed Earth: 3.5 billion years ago — the first simple life appeared in oceans. 470 million years ago — the first tiny land plants appeared near wet places. 385 million years ago — the first true trees appeared, with roots, branches, and woody trunks. 360–300 million years ago — huge swamp forests covered Earth. Dead trees piled up in wetlands and slowly became coal over millions of years.

Trees solved two huge problems — staying upright against gravity (lignin made strong trunks possible), and reaching sunlight (tall trees captured more light).

Forests also changed Earth's atmosphere. Plants absorbed carbon dioxide and released oxygen. Oxygen levels rose, helping large animals eventually survive on land.

Without forests, humans, animals, rich soil, and even much of Earth's oxygen would not exist today. Trees did not simply decorate the planet — they completely transformed it.