Problem: Given the question: Greenhouse Effect: The solar energy reaching the surface of the Earth is concentrated in short wavelengths, which can easily penetrate the greenhouse gases, such as carbon dioxide and methane. The Earth, however, is cooler than the sun and it radiates its heat in the form of energy in the far infrared range. These longer wavelengths are partially absorbed by the greenhouse gases and some of the solar heat is returned to Earth. At a certain temperature these processes are in equilibrium and the surface temperature of the Earth is stable. However, if more greenhouse gases are put in the atmosphere the amount of trapped terrestrial radiation increases, leading to an increase in global temperature. Two new planets have just been discovered in our solar system. Scientists have just landed on both and are in the process of analyzing the environment and atmosphere of each planet. What is immediately apparent is that both planets are remarkably similar to Earth since both are oxygen rich and do not require a space suit to breathe. Another similarity that one of the planets, Jarthrow, has with Earth is that it naturally outputs approximately the same amount of greenhouse gases into the atmosphere as Earth does. The other planet, Millhouse, outputs about twice as many greenhouse gases. Climate scientists are rushing to try to see if anything new can be discovered to help out our planet with these new discoveries. Will Jarthrow have a higher or lower temperature than Millhouse?
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The answer is:
lower

Problem: Given the question: When humans dig up and use fossil fuels, we have an impact on the carbon cycle ( Figure below ). This carbon is not recycled until it is used by humans. The burning of fossil fuels releases more carbon dioxide into the atmosphere than is used by photosynthesis. So, there is more carbon dioxide entering the atmosphere than is coming out of it. Carbon dioxide is known as a greenhouse gas , since it lets in light energy but does not let heat escape, much like the panes of a greenhouse. The increase of greenhouse gasses in the atmosphere is contributing to a global rise in Earth's temperature, known as global warming or global climate change. Greg is an environmental scientist. He wants to know how earth's atmosphere differed in two different time. To that end, he selected two time periods, time A and time B. Time A is set in the year one thousand when using fossil fuels was not very common. Time B is set in the year two thousand when fossil fuels are used in large quantities. In which time less carbon dioxide would be realeased into the atmosphere, time A or time B?
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The answer is:
time A

Problem: Given the question: Because of human activities, there is more carbon dioxide in the atmosphere today than in the past hundreds of thousands of years. Burning fossil fuels and has released great quantities of carbon dioxide into the atmosphere. Cutting forests and clearing land has also increased carbon dioxide into the atmosphere because these activities reduce the number of autotrophic organisms that use up carbon dioxide in photosynthesis. In addition, clearing often involves burning, which releases carbon dioxide that was previously stored in autotrophs. Two cities had different energy source. Big city burned fossil fuels, while Blue city used alternative sources of energy. Which city produced more carbon dioxide?
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The answer is:
Big