Final answer:
Burning fossil fuels is the leading cause of increased greenhouse gas levels, primarily due to the release of carbon dioxide into the atmosphere.
Explanation:
The burning of fossil fuels, such as coal, oil, and gas, for energy and transportation, is the primary cause of the majority of greenhouse gases produced today. Fossil fuels contain high levels of carbon, and when burned, release carbon dioxide into the atmosphere, contributing significantly to the greenhouse effect. This human activity has led to a substantial increase in greenhouse gas concentrations and subsequent climate change.
Learn more about Greenhouse gases and fossil fuels here:
https://brainly.com/question/23112126
