Before revision: Land plants were so successful that they are thought to have contributed to the Late Devonian extinction event by a complicated process: (1) early tree archaeopteris drew down CO2 levels, leading to global cooling and lowered sea levels, (2) roots of archeopteris fostered soil development which increased rock weathering ; and (3) the subsequent nutrient run-off may have triggered algal blooms resulting in anoxic eventswhich caused die-offs among marine species, the primary victims of the extinction .
After revision: Land plants were so successful that they are thought to have contributed to the Late Devonian extinction event as early tree archaeopteris drew down CO2 levels, leading to global cooling and lowered sea levels, while their roots increased rock weathering and nutrient run-offs which may have triggered algal bloom anoxic events .