A friend who's skeptical about climate change argues that...

A friend who's skeptical about climate change argues that the roughly $0.85^{\circ} \mathrm{C}$ increase in Earth's temperature during the industrial era could be caused by an increase in the Sun's power output. The Sun's average power has, in fact, increased by about $0.05 \%$ during this time. Could your friend be right?

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Key Concepts

Solar Irradiance

Solar irradiance refers to the amount of solar energy received per unit area at the Earth’s surface. Variations in solar irradiance, whether due to natural cycles or long-term changes in the Sun's output, can influence the Earth’s climate. However, even small percentage changes in solar output have relatively minor impacts on global temperature when compared to other factors such as atmospheric composition.

Radiative Forcing

Radiative forcing is a measure of the influence a factor has in altering the balance of incoming and outgoing energy in the Earth-atmosphere system. It quantifies how different factors, including changes in solar irradiance and greenhouse gas concentrations, affect climate. A positive radiative forcing leads to warming, while a negative forcing results in cooling, and the magnitude of the forcing determines its impact on global temperature.

Anthropogenic Greenhouse Gas Emissions

Anthropogenic greenhouse gas emissions are gases released by human activities, notably since the Industrial Revolution, that trap heat in the atmosphere. This enhanced greenhouse effect is considered the primary driver of the observed global warming. The accumulation of these gases, particularly carbon dioxide, significantly increases radiative forcing, leading to the temperature changes observed over the industrial era.

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