This essay examines the relationship between human activities and climate change, asserting that increased gas concentrations in the atmosphere, particularly since the industrial revolution, are largely due to human actions. It highlights the role of fossil fuel combustion, deforestation, and cement manufacture in increasing CO2 emissions. While natural factors like volcanic eruptions and solar variations also contribute, the essay emphasizes that human-induced greenhouse gas emissions, especially CO2, have had a dominant warming effect. Climate models support the conclusion that the warming observed over the past 150 years is primarily driven by human activities, outweighing natural influences. The essay also notes the impact of human activities on land cover and the release of other greenhouse gases like nitrous oxide and halocarbons. Ultimately, it concludes that human actions are the primary cause of global warming since the 20th century, with farming, livestock, and deforestation contributing significantly to the increase in greenhouse gas concentrations.