Earth now a 'Hybrid Planet', as per a new classification
In a new 5-tier classification of worlds, US-based scientists have categorised Earth as a hybrid between Class IV, where life-forms have started affecting planetary-scale changes, and Class V, where it would be affected by advanced life-forms. They denoted Class I as atmosphere-less worlds, Class II as lifeless planets with atmospheres, and Class III, where life-forms haven't altered the planet.