Final answer:
Human activities have altered the chemistry of Earth's atmosphere by releasing greenhouse gases, leading to changes in the Earth's climate such as global warming and more extreme weather events.
Step-by-step explanation:
Human activities have altered the chemistry of Earth's atmosphere primarily through the release of greenhouse gases. The burning of fossil fuels, deforestation, and industrial processes have resulted in increased levels of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) in the atmosphere. These greenhouse gases trap heat and contribute to the enhanced greenhouse effect, leading to changes in the Earth's climate.
These changes in the composition of the atmosphere impact the Earth's climate in several ways. The increased concentration of greenhouse gases traps more heat in the atmosphere, causing global warming. This leads to rising temperatures, melting ice caps, and sea-level rise. The changes also affect weather patterns, precipitation, and the frequency and intensity of extreme weather events like hurricanes and droughts.