Solar and Wind R+Q

What percentage has the price of solar panels fallen in the past five years?

• 80%

• 50%

• 30%

• 20%

Which country introduced an expanded system of feed-in tariffs in 2004?

• Germany

• United States

• China

• India

In 2013, solar accounted for less than ___ percent of the world's electricity supply.

What is the main challenge of integrating solar power into the energy grid?

• Intermittent power supply

• High cost of solar panels

• Lack of government support

• Limited availability of sunlight

Which company announced a plan to spend $850 million on solar power?

• Apple

• Google

• Microsoft

• Amazon

The first photovoltaic cell was made by AT&T's Bell Labs in which year?

• 1953

• 1963

• 1973

• 1983

The global agreement reached in Paris in December was certain to spur significant new investments in ___ energy.