Question

4. What are carbon dioxide levels now? How often in the past 650,000 years have they been that high?

short answer please:)

Answer 1

Step-by-step explanation:

Scientists at the Mauna Loa observatory in Hawaii say that CO2 levels in the atmosphere now stand at 387 parts per million (ppm), up almost 40% since the industrial revolution and the highest for at least the last 650,000 years.