Question

Explain why scientists are concerned about human activities that cause global warming if global warming is caused by the greenhouse effect and the greenhouse effect is a natural part of Earth’s climate.
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Answer 1

The greenhouse effect is a natural and necessary process that keeps Earth warm enough for life, but scientists are concerned because human activities — mainly burning fossil fuels, deforestation, and some industrial processes — are adding large amounts of greenhouse gases to the atmosphere and strengthening that effect. That extra trapping of heat is happening much faster and to a greater extent than natural climate changes, driving sea‑level rise, stronger and more frequent extreme weather, ecosystem disruption, and risks of irreversible feedbacks; because CO2 persists for decades to centuries, the harms and adaptation costs can be long‑lasting.