Global warming

Definition

Global warming refers to the long-term increase in Earth's average surface temperature due to human activities, primarily the emission of greenhouse gases like carbon dioxide and methane. This phenomenon is a significant aspect of environmental changes that have far-reaching impacts on ecosystems, weather patterns, and sea levels, contributing to broader environmental geology issues and human influences on the planet.

5 Must Know Facts For Your Next Test

1. Global temperatures have risen approximately 1.2 degrees Celsius since the late 19th century due to increased greenhouse gas emissions.
2. Melting ice caps and glaciers contribute to rising sea levels, posing a threat to coastal communities and ecosystems.
3. Extreme weather events such as hurricanes, droughts, and heatwaves are becoming more frequent and severe as a result of global warming.
4. Human activities like burning fossil fuels, deforestation, and industrial processes are the primary contributors to increased greenhouse gas concentrations in the atmosphere.
5. Mitigation strategies include transitioning to renewable energy sources, improving energy efficiency, and promoting reforestation efforts to absorb carbon dioxide.

Review Questions

• How do human activities contribute to global warming, and what are some key examples?
  • Human activities contribute to global warming mainly through the burning of fossil fuels for energy, which releases large amounts of carbon dioxide into the atmosphere. Other examples include deforestation, which reduces the number of trees that can absorb carbon dioxide, and industrial processes that emit various greenhouse gases. These actions significantly increase the concentration of greenhouse gases in the atmosphere, enhancing the greenhouse effect and raising global temperatures.
• Discuss the potential environmental impacts of global warming on coastal regions.
  • Global warming leads to rising sea levels due to melting ice caps and thermal expansion of seawater. This rise poses serious risks to coastal regions, including increased flooding, erosion, and loss of habitat for wildlife. Additionally, coastal communities may face economic challenges as infrastructure is damaged and ecosystems are disrupted. The changing climate can also lead to saltwater intrusion into freshwater resources, further threatening agriculture and drinking water supplies.
• Evaluate the effectiveness of international agreements aimed at combating global warming and their role in shaping future policies.
  • International agreements like the Paris Agreement aim to limit global warming by committing countries to reduce greenhouse gas emissions. The effectiveness of these agreements depends on the willingness of nations to adhere to their targets and enhance their commitments over time. While some progress has been made in raising awareness and fostering cooperation among countries, challenges remain due to varying levels of economic development and political will. Future policies will need to balance environmental goals with economic considerations while ensuring equitable contributions from all nations.

Related terms

greenhouse effect: The process by which certain gases in Earth's atmosphere trap heat, preventing it from escaping into space and leading to an increase in global temperatures.

climate change: A broader term that encompasses global warming, referring to long-term changes in temperature, precipitation, and other atmospheric conditions on Earth.

carbon footprint: The total amount of greenhouse gases emitted directly or indirectly by an individual, organization, event, or product, often measured in units of carbon dioxide equivalents.