Best-seller author and scientist Gregg Braden: "Climate change is a fact. It's also a fact that humans are not causing it. Is there more CO₂ in the atmosphere now than there was 10 years, 20, 50, 100 years ago? The answer is absolutely yes. Is this a bad thing? The answer is no. Is it the most we've ever had? We're right about 440 parts per million right now. In geologic history, the Jurassic period had over a thousand parts per million. Triassic, 2,000 parts per million. The Earth was lush. The Earth was green. Life was abundant during that time. 90% of the CO₂ comes from the warming oceans, due to geologic processes and tectonic activity that happen every 12,500 years."