1. Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Due to the increased burning of fossil fuels, atmospheric CO 2 is increasing. - CO 2 warms the Earth’s surface by trapping heat in the atmosphere. - This is called the greenhouse effect Human Activity is Causing Global Warming; Photosynthesis Attempts to Moderate It. ATMOSPHERE Radiant heat trapped by CO 2 and other gases

2. Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Because photosynthesis removes CO 2 from the atmosphere, it helps to moderate the greenhouse effect. - Unfortunately, deforestation may cause a decline in global photosynthesis. Atmospheric Carbon Dioxide Concentrations The Concentrations of Carbon Dioxide in the atmosphere fluctuates between winter and summer because of seasonal variation in photosynthesis. The average concentration is increasing owing to human activities – in particular, burning fossil fuels and deforestation (All measurements made from Hawaii).

3. Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Global Carbon Cycle

4. Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings BIO 141 Botany with Laboratory This product is sponsored by a grant awarded under the President’s Community-Based Job Training Grants as implemented by the U.S. Department of Labor’s Employment and Training Administration. The information contained in this product was created by a grantee organization and does not necessarily reflect the official position of the U.S. Department of Labor. All references to non-governmental companies or organizations, their services, products, or resources are offered for informational purposes and should not be construed as an endorsement by the Department of Labor. This product is copyrighted by the institution that created it and is intended for individual organizational, non-commercial use only.