Question

what are humans doing to release significant amounts of excess carbon into the atmosphere, leading to climate change? breathing out too much carbon dioxide not keeping enough house plants keeping too many pets burning sequestered carbon fossil fuels

Explanation:

• Option "breathing out too much carbon dioxide": Human respiration is a natural process, and the CO₂ released is part of the carbon cycle, not a significant excess contributor to climate change.
• Option "not keeping enough house plants": House plants have a negligible impact on global carbon levels compared to large - scale human activities.
• Option "keeping too many pets": Pet ownership does not release significant excess carbon into the atmosphere on a global scale.
• Option "burning sequestered carbon fossil fuels": Burning fossil fuels (coal, oil, gas) releases carbon that was sequestered underground for millions of years. This adds large amounts of CO₂ to the atmosphere, disrupting the carbon cycle and contributing to climate change.

Answer:

D. burning sequestered carbon fossil fuels