Question

which would be an accurate and specific observation for the graph shown? world electricity generation (in million gigawatt hours) chart with years 2000, 2005, 2010, 2015, 2020, and energy sources: coal, gas, oil and other, wind and solar, hydroelectric and snow, nuclear, renewables? options: a) wind and solar energy generation decreased in 2020. b) there is more energy being used now than there used to be. c) the amount of clean energy generated increased by 5 million gigawatt hours in 2000 to about 10 million gigawatt hours in... d) coal energy generation went from 7 million gigawatt hours in 2000 to 3 million gigawatt hours in 2020.

Explanation:

• Option a: The "Wind and solar" layer (orange) is increasing over time, so generation did not decrease in 2020. Eliminate a.
• Option b: The total height of the stacked area (all energy sources) increases from 2000 to 2020, meaning total energy generation (usage, assuming consumption follows generation) is higher now. This is a valid observation.
• Option c: Clean energy (e.g., wind, solar, hydro, nuclear) – the increase from 2000 to 2020 is not 5 million to 10 million (the total graph goes from ~15 to ~25 million, and clean energy layers are part of that). The numbers don’t match. Eliminate c.
• Option d: The "Coal" layer (dark purple) starts at ~5 million in 2000 and increases, not decreases to 3 million. Eliminate d.

Answer:

b. There is more energy being used now than there used to be.