In this task, you are given a paragraph, and your job is to generate comma-separated entities present in the given paragraph. Generate entities from a given passage in such a way that (i) they are present in the paragraph, (ii) they are non-duplicate, (iii) they underwent a state change during the process. Avoid creating entities that (i) aren't present in the process paragraph and (ii) aren't significant. 

[EX Q]: Greenhouse gases are released into the air by human activities. The earth changes energy from the sun into heat. Heat rises from the ground. Greenhouse gas molecules in the atmosphere prevent the heat from going into space. The temperature of the earth increases. The temperature continues to rise and melts the polar ice caps. The temperature rises even faster. 
[EX A]: greenhouse gas ,air ,earth ,energy from sun ,heat ,greenhouse gas molecules ,polar ice cap 

[EX Q]: Waste products are deposited in the blood. Blood is carried to the kidneys through the renal arteries. The kidneys contain filters inside. The filters capture the waste products. The waste is combined with water to make urine. The urine leaves the kidney and is collected in the bladder. The cleaned blood is returned to the body. 
[EX A]: waste products ,blood ,water ,urine 

[EX Q]: A fuel source must produce heat. Heat is used to create steam. Steam will be used to power turbines. Turbines will work together with magnets to generate electricity. Electricity or moving electrons will then flow through wires. The wires will carry electrons to homes and businesses remotely. 
[EX A]:
Fuel Source ,Heat ,Steam ,Electricity