9.4 Increases in the Greenhouse Gases

Identify the threats to human health and the environment posed by an increase in greenhouse gases.

• Global climate change, caused by excess greenhouse gases in the atmosphere, can lead to a variety of environmental problems including rising sea levels resulting from melting ice sheets and ocean water expansion, and disease vectors spreading from the tropics toward the poles. These problems can lead to changes in population dynamics and population movements in response.
• Enduring understanding STB-4: Local and regional human activities can have impacts at the global level.