Question

the graph shows the amount of carbon dioxide (co₂) emissions per year over time. students learn that carbon dioxide is a greenhouse gas that contributes to climate change. they want to identify the sources of carbon dioxide emissions in order to make a plan to reduce their towns impact on climate change. which two processes contributed most to the changes in carbon dioxide concentrations since 1985? a. respiration of a growing population b. transportation of goods and people c. manufacturing of materials like cement d. development of renewable energy sources e. expansion of public transportation services

Explanation:

Respiration is a natural process and has a relatively stable contribution to CO₂ levels. Development of renewable energy sources and expansion of public transportation services reduce CO₂ emissions. Transportation of goods and people (using fossil - fuel powered vehicles) and manufacturing of materials like cement are major human - induced sources of CO₂ emissions that have increased over time.

Answer:

B. transportation of goods and people
C. manufacturing of materials like cement