The graph shows the amount of carbon dioxide (CO2) emissions per year over time.

Question

40-
35 30
35 25-
20-
0-
1985
CO₂ Emissions (kilotons)
1990
1995
Year
2000
2005
2010
Adapted from The World Bank Carbon Dioede Laboratory. Tennessee. United States. intomaton Analysis Canter, Environmental Scences Division, Dak Roge Nattonal
2015
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 town's 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

Answer 1

The two processes that contributed most to the changes in carbon dioxide concentrations since 1985 are:

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

These processes are significant sources of carbon dioxide emissions, while options like development of renewable energy sources and expansion of public transportation services typically have the opposite effect by reducing emissions.