What percentage of carbon dioxide is increased for the last 200 years?
Answers
Answer:
Concentrations of CO
2 in the atmosphere were as high as 4,000 parts per million (ppm, on a molar basis) during the Cambrian period about 500 million years ago to as low as 180 ppm during the Quaternary glaciation of the last two million years.[2] Reconstructed temperature records for the last 420 million years indicate that atmospheric CO
2 concentrations peaked at ~2000 ppm during the Devonian (∼400 Myrs ago) period, and again in the Triassic (220–200 Myrs ago) period. Global annual mean CO
2 concentration has increased by more than 45% since the start of the Industrial Revolution, from 280 ppm during the 10,000 years up to the mid-18th century[2] to 415 ppm as of May 2019.[3][4] The present concentration is the highest for 14 million years.
about 3%
Answer:
I think 3%
Explanation: