Which factor is a primary driver of climate change?

• A. Increase in greenhouse gas emissions is the primary driver.
• B. Natural fluctuations alone.
• C. Tides.
• D. Annual rainfall variance.

Answer: (A)

The main driver of climate change is the increased concentration of greenhouse gases in the atmosphere caused by human activities. When we burn fossil fuels for energy and transportation, and when we fertilizer and manage crops, we release gases like carbon dioxide, methane, and nitrous oxide. These gases trap heat in the lower atmosphere and oceans, boosting the Earth’s energy‑retaining blanket and raising global temperatures over long timescales. This forcing from greenhouse gases explains the persistent warming trend seen over the past century and into the present.

Natural fluctuations can cause year-to-year or decade-to-decade variability, but they don’t produce the sustained trend in warming that greenhouse gas forcing does. Tides are driven by the gravitational pull of the Moon and Sun and don’t drive climate change. Annual rainfall variance reflects the resulting changes in climate patterns, not the primary cause themselves.