REP Sustainability Practices & Environmental Impact 2

Question 1

Which greenhouse gas has the highest 100-year Global Warming Potential (GWP) among those commonly tracked in energy sector reporting?

Accepted Answer

Sulfur hexafluoride (SF6)

Answer

SF6 has a 100-year GWP of approximately 23,500, far exceeding CO2 (1), CH4 (~27-30), and N2O (~273).

Question 2

What does a 'cradle-to-grave' lifecycle assessment (LCA) encompass?

Accepted Answer

Raw material extraction through end-of-life disposal

Answer

Cradle-to-grave LCA covers all stages from raw material extraction through manufacturing, use, and final disposal.

Question 3

Which metric measures the ratio of energy delivered by a renewable system over its lifetime to the energy required to build, operate, and decommission it?

Accepted Answer

Energy Return on Energy Invested (EROI)

Answer

EROI quantifies how much energy a system produces relative to the energy consumed across its entire lifecycle.

Question 4

Land use change associated with large-scale bioenergy crops can lead to which environmental concern?

Accepted Answer

Carbon debt from displaced ecosystems

Answer

Converting forests or grasslands to bioenergy crops releases stored carbon, creating a 'carbon debt' that can take decades to repay.

Question 5

Under the US EPA's Renewable Fuel Standard (RFS), advanced biofuels must achieve what minimum lifecycle GHG reduction compared to the fossil fuel baseline?

Accepted Answer

50%

Answer

Advanced biofuels under the RFS must achieve at least a 50% lifecycle GHG reduction versus the petroleum baseline they displace.

(REP) Certified Renewable Energy Professional Practice Test

(REP) Certified Renewable Energy Professional Practice Test

REP Sustainability Practices & Environmental Impact 2