Here is a question about this article: In the US, one kilowatt-hour (3.6 MJ) of electricity currently causes an average 1.34 pounds (610 g) of CO
2 emission. Assuming the average light bulb is on for 10 hours a day, a 40-watt bulb will cause 196 pounds (89 kg) of CO
2 emission per year. The 6-watt LED equivalent will only cause 30 pounds (14 kg) of CO
2 over the same time span. A building's carbon footprint from lighting can therefore be reduced by 85% by exchanging all incandescent bulbs for new LEDs if a building previously used only incandescent bulbs.
What is the answer to this question: How much CO2 emission would a 40-watt light bulb produce after 10 hours?
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So... 196 pounds

Here is a question about this article: The Parliament of Estonia (Estonian: Riigikogu) or the legislative branch is elected by people for a four-year term by proportional representation. The Estonian political system operates under a framework laid out in the 1992 constitutional document. The Estonian parliament has 101 members and influences the governing of the state primarily by determining the income and the expenses of the state (establishing taxes and adopting the budget). At the same time the parliament has the right to present statements, declarations and appeals to the people of Estonia, ratify and denounce international treaties with other states and international organisations and decide on the Government loans.
What is the answer to this question: What can the Estonian parliament do in regards to treaties?
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So... ratify and denounce international treaties

Here is a question about this article: The HoustonThe WoodlandsSugar Land MSA's gross domestic product (GDP) in 2012 was $489 billion, making it the fourth-largest of any metropolitan area in the United States and larger than Austria's, Venezuela's, or South Africa's GDP. Only 26 countries other than the United States have a gross domestic product exceeding Houston's regional gross area product (GAP). In 2010, mining (which consists almost entirely of exploration and production of oil and gas in Houston) accounted for 26.3% of Houston's GAP up sharply in response to high energy prices and a decreased worldwide surplus of oil production capacity, followed by engineering services, health services, and manufacturing.
What is the answer to this question: Where in the rankings does Houston's gross domestic product place it compared to other U.S. domestic areas?
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So...
fourth-largest