- Experts have raised red flags about the warming of planet by 2 degrees Celsius
- John Sutter: This one little number is significant as a way to focus world's attention on problem
CNN columnist John D. Sutter is spending the rest of the year reporting on a tiny number -- 2 degrees -- that may have a huge impact on the future of the planet. He'd like your help. Subscribe to the "2 degrees" newsletter or follow him on Facebook, Twitter and Instagram. You can shape his coverage.
(CNN)We're 2 degrees from a different world.
1. Where did the idea for 2 degrees come from?
2. How did 2 degrees become the international standard?
3. What would the world look like at 2 degrees?
• Hurricanes are expected to become 2% to 8% more intense.
• A range of species will be at risk for extinction, particularly amphibians. The IPCC estimates 20% to 30% of animals and plants species will be at "increasingly high risk of extinction" at or near the 2-degree mark.
• The Arctic is expected keep melting, losing 30% of its annual average sea ice.
• Certain crop yields in the United States, India and Africa are expected to decrease 10% to 30%.
• The availability of freshwater is expected to decline by 20%.