Scientists warn that critical Earth systems are closer to destabilisation than previously thought, risking a 'hothouse' Earth scenario due to climate feedback loops. Research led by William Ripple from Oregon State University highlights the urgency of addressing climate change, with evidence of temperature increases exceeding 1.5 degrees Celsius and the highest CO2 levels in 2 million years. The study emphasizes the need for immediate climate mitigation strategies to avoid irreversible consequences.