By what percentage has CO2 in the atmosphere increased since the industrial age?

The chosen answer reflects a significant increase in atmospheric carbon dioxide levels since the industrial age, which began in the late 18th century. Scientific measurements indicate that CO2 concentrations have risen from about 280 parts per million (ppm) prior to industrialization to over 400 ppm in recent years. This constitutes an increase of approximately 42 percent.

Understanding the context of this increase is crucial. The industrial revolution initiated widespread fossil fuel combustion for energy, leading to higher emissions of carbon dioxide and other greenhouse gases. This rise contributed to global warming and climate change, leading to concern among scientists and policymakers alike. The choice of 42 percent accurately represents this substantial increase, reflecting the ongoing relevance of CO2 levels in discussions about environmental impact and climate policy.