"<a href=""https://www.youtube.com/watch?v=ZecQ64l-gKM&amp;t=42m00s"">42:00</a> Biology has done a fantastic job of fixing CO2 via fish skeletons and the like sinking to the ocean floor. A few million years and the job will be complete - CO2 below 150ppm", photosynthesis stops, all life on Earth finishes. <br>It's quite scary when a scientist of this calibre talks about creating faster ways of extinguishing life on Earth by accelerating the CO2 decline.