Final answer:
Human activities such as a. increased greenhouse gas emissions and deforestation are two examples of how the growing number of humans and the use of natural resources can affect Earth's systems.
Step-by-step explanation:
Two examples of how the growing number of humans and the use of natural resources by humans affect Earth’s systems are a. increased greenhouse gas emissions leading to climate change and deforestation and loss of biodiversity.
Increased greenhouse gas emissions leading to climate change: The burning of fossil fuels for energy and transportation releases carbon dioxide and other greenhouse gases into the atmosphere. These gases trap heat, leading to a rise in global temperatures and changes in weather patterns. This can result in more frequent and severe heatwaves, storms, and droughts, affecting ecosystems and human communities.
Deforestation and loss of biodiversity: Human activities such as logging, farming, and urbanization often involve clearing large areas of forests. This destroys habitats for many species and reduces overall biodiversity. It can also contribute to soil erosion, water pollution, and changes in local climate conditions.