Caila designs a model to test how the use of different combinations of energy resources would affect global temperatures. Which of these combinations is likely to produce the lowest increase in temperature in her model?

A. Geothermal and oil

B. Solar and hydroelectric

C. Biofuels and wind

D. Natural gas and coal

The answer is B. Solar and hydroelectric energy are renewable sources of energy. This means that they are sustainable hence cannot be depleted since they renew themselves at sufficient rates. They have the lowest carbon footprint compared to the other choices’ combinations. Therefore due to their low greenhouse gas emissions, they contribute the least to global warming.

Solar and hydroelectric (just took test)