Question

human activities and earth’s atmosphere
evidence from scientific studies supports the claim that human activities are contributing to the increasing average global surface temperature on earth as observed for the past 100 years. the concentration of greenhouse gases in earth’s atmosphere have increased during this time and are thought to be the major cause for changes in global climate. graph 1 represents the relative contribution of human activities that are likely causing global climate change. graph 2 represents the relative amounts of various greenhouse gases in the atmosphere.
graph 1: contribution of human activities to global climate change
graph 2: relative amounts of greenhouse gases in atmosphere
an environmental group recommends a way to help slow global climate change. based on data in graph 1, which activity would have the greatest positive impact on slowing global climate change?
○ limiting the clearing of land for building houses
● using renewable energy sources instead of fossil fuels
○ using organic farming methods instead of harsh chemicals
○ collecting wastewater from industry instead of releasing into rivers

Explanation:

Graph 1 shows burning fossil fuels is a major contributor to climate change (47%). Using renewable energy instead of fossil fuels directly reduces this major source of greenhouse gas emissions, having the greatest positive impact on slowing climate change. Limiting land clearing helps but is a smaller contributor (deforestation 14%). Organic farming and wastewater collection address smaller or different aspects, not the largest emission source.

Answer:

B. using renewable energy sources instead of fossil fuels