Climate Change Science & Modeling Flashcards

What is the greenhouse effect?

Answer: A warming process that helps maintain life on Earth.

The greenhouse effect is a natural process where certain gases in Earth's atmosphere trap heat from the sun, preventing it from escaping back into space. This trapped heat warms the planet, making its average temperature suitable for life. Without this natural warming, Earth would be too cold to support the diverse ecosystems we know.

What are the main greenhouse gases contributing to global warming?

Answer: Carbon dioxide, methane, and nitrous oxide.

The main greenhouse gases contributing to global warming from human activities are carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). While water vapor is also a significant greenhouse gas, these three are primarily responsible for the enhanced greenhouse effect due to their increased concentrations from human industrial, agricultural, and energy-related emissions.

What is the impact of deforestation on climate change?

Answer: It increases the amount of carbon dioxide in the atmosphere.

Forests act as vital carbon sinks, absorbing large amounts of carbon dioxide from the atmosphere through photosynthesis. Deforestation, the clearing of forests, releases this stored carbon back into the atmosphere when trees are cut down or burned. This process significantly increases atmospheric CO2 levels, thereby intensifying the greenhouse effect and contributing to global warming.

How does climate change affect ocean levels?

Answer: Climate change leads to rising ocean levels due to melting ice.

Climate change leads to rising ocean levels primarily through two mechanisms. First, global warming causes glaciers and ice sheets to melt at an accelerated rate, adding water to the oceans. Second, as ocean water warms, it expands (thermal expansion), further contributing to the increase in sea volume. Both factors threaten coastal communities and ecosystems worldwide.

What is climate modeling used for?

Answer: To simulate future climate conditions under different scenarios.

Climate modeling uses complex computer programs to simulate the interactions of Earth's climate system, including the atmosphere, oceans, land surface, and ice. These models are crucial for understanding past climate changes and, more importantly, for predicting future climate conditions under various greenhouse gas emission scenarios. This helps scientists and policymakers assess potential impacts and develop mitigation strategies.

How can renewable energy contribute to combating climate change?

Answer: By reducing dependence on fossil fuels.

Renewable energy sources, such as solar, wind, and hydropower, generate electricity without burning fossil fuels. Fossil fuels are a major source of greenhouse gas emissions, particularly carbon dioxide, which drives climate change. By transitioning to renewable energy, societies can significantly reduce their carbon footprint and dependence on polluting energy sources, directly combating global warming.

What is the role of carbon sequestration in climate change mitigation?

Answer: It captures and stores carbon to reduce atmospheric CO2.

Carbon sequestration refers to the long-term storage of carbon dioxide (CO2) to prevent its release into the atmosphere. This can occur naturally, such as through reforestation and ocean absorption, or through engineered processes like carbon capture and storage (CCS) technologies. Its role in climate change mitigation is to actively remove or prevent the accumulation of CO2, thereby reducing atmospheric greenhouse gas concentrations.

How does deforestation contribute to global warming?

Answer: It releases stored carbon and increases greenhouse gases.

Trees and other vegetation absorb carbon dioxide from the atmosphere and store it in their biomass, acting as natural carbon sinks. When forests are cleared, especially through burning, this stored carbon is released back into the atmosphere as CO2. This process reduces the Earth's capacity to absorb carbon and directly increases the concentration of greenhouse gases, intensifying global warming.