In this task, you will be given a passage, a question and a list of single-word events identified from the passage. The goal is to point out all events from the given event list that can answer the question. If a question is unanswerable or none of the events answer the question, output should be empty.

Passage: "When completed, the hydropower station will slightly raise the water levels of the two tributaries and the humidity of the natural reserve will also rise," said Gyina, adding that this will help the growth of the subtropical wildlife in the area, especially the 12,000 hectares of bamboos that giant pandas feast on. The Xiluodu hydropower station will replace local thermal power plants, which means 41 million tons less coal burnt each year, said the official. Question: What happens before the water levels are raised? Events: ['completed', 'raise', 'rise', 'said', 'adding', 'help', 'growth', 'feast', 'replace', 'said', 'means', 'burnt']

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
completed