Making cement from a different type of rock could clean up emissions

A breakthrough method using alternative rock types for cement production could slash 2 billion tons of CO₂ annually—nearly 8% of global emissions—without costly carbon capture. This outperforms #2's regulatory approach to environmental impact by addressing the root emissions source directly. Traditional cement accounts for 7-8% of human-made CO₂, and this new process leverages rocks like serpentinite to reduce temperatures by 300°C, cutting energy use by 25%. The potential is transformative: if adopted globally, it could achieve more annual CO₂ reduction than the entire aviation industry emits. This data-led innovation offers a scalable, immediate solution, making it the strongest climate contender on the list.