Chapter 46, Problem 2DAA

Summary Introduction

To determine: The number of times carbon dioxide reached a level during 400, 000 B.C. and 0 A.D comparable to that measured in 1980.

Introduction: The carbon dioxide concentration is rising, and the present-day concentration is the highest in 15 million years. It is more because of the result of human activities that contributed to an increase in the carbon dioxide level in Earth’s atmosphere. The major contribution is by burning of fossil fuels that releases high amount of carbon in the atmosphere. This impacts the climate and ecosystems.