Photosynthesizing

Stromatolites are the limestone structures formed by photosynthesizing bacteria called cyanobacteria. They created layers of alternating slimy bacteria and sediment in very shallow water, dominating shallow seas until predators, such as trilobites, came into the picture.

Aspen also produce chlorophyll in their bark, allowing the tree to begin photosynthesizing before leaves have emerged.

A thick blanket of dust that was thrown up darkened the globe, affecting plants and other photosynthesising life.