CO2 levels could soon reach those of 50M years ago, when the planet was 20°F warmer and palms grew in the Arctic. https://t.co/qh9DRjWjUw pic.twitter.com/3XLXxQN1nO — John Upton (@johnupton) April 4, 2017
CO2 levels could soon reach those of 50M years ago, when the planet was 20°F warmer and palms grew in the Arctic. https://t.co/qh9DRjWjUw pic.twitter.com/3XLXxQN1nO
— John Upton (@johnupton) April 4, 2017