Final answer:
Using solar panels reduces levels of greenhouse gases in the atmosphere, as they do not produce carbon dioxide or other greenhouse gases. This shift towards renewable energy sources is crucial for mitigating the effects of global warming and climate change.
Step-by-step explanation:
Oscar's family's decision to put solar panels on their roof represents a shift towards alternative, or renewable, energy sources, which has implications for Earth's atmosphere. The correct answer to how alternative energy sources will affect Earth's atmosphere is B. They will reduce levels of greenhouse gases in the atmosphere. Unlike fossil fuels, solar panels and other renewable energy sources do not produce carbon dioxide or other greenhouse gases as by-products. Therefore, their use can lead to a decrease in the atmospheric concentration of these gases, which are known to contribute to global warming and climate change by trapping heat within the atmosphere.
The increased use of alternative energy sources such as solar, wind, hydro, and nuclear can mitigate the negative impacts of rising greenhouse gas levels, which include sea level rise, ocean acidification, and changes in climate that can affect weather patterns, agricultural outputs, and ecosystems.