Identify two major natural climate drivers and two human-induced drivers of climate change.

Identify two major natural climate drivers and two human-induced drivers of climate change.

• A. Natural: volcanic activity, variations in solar radiation. Human: greenhouse gas emissions from fossil fuels, deforestation.
• B. Natural: volcanic activity; Human: ocean salinity changes.
• C. Natural: ocean currents; Human: wind patterns.
• D. Natural: rainbow phenomena; Human: cloud aesthetics.

Answer: (A)

Two major natural forces influencing climate are variations in solar radiation and volcanic activity. Changes in solar output alter the energy reaching Earth, affecting warming or cooling over different timescales. Volcanic eruptions eject aerosols that reflect sunlight, often causing short-term cooling and disruptions to atmospheric circulation. On the human side, the two key drivers are greenhouse gas emissions from burning fossil fuels, which trap more heat in the atmosphere, and deforestation, which reduces the land’s capacity to absorb CO2. These human factors add to natural variability and help explain long-term trends in climate. The other options describe factors that aren’t major global climate drivers in the same way: ocean salinity changes, natural ocean currents, or wind patterns are natural features rather than dominant human-induced forcings, and rainbow phenomena or cloud aesthetics aren’t recognized drivers of climate change.

Two major natural forces influencing climate are variations in solar radiation and volcanic activity. Changes in solar output alter the energy reaching Earth, affecting warming or cooling over different timescales. Volcanic eruptions eject aerosols that reflect sunlight, often causing short-term cooling and disruptions to atmospheric circulation. On the human side, the two key drivers are greenhouse gas emissions from burning fossil fuels, which trap more heat in the atmosphere, and deforestation, which reduces the land’s capacity to absorb CO2. These human factors add to natural variability and help explain long-term trends in climate. The other options describe factors that aren’t major global climate drivers in the same way: ocean salinity changes, natural ocean currents, or wind patterns are natural features rather than dominant human-induced forcings, and rainbow phenomena or cloud aesthetics aren’t recognized drivers of climate change.