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To force a bill out of commnittee, a DISCHARGE petition must be signed by a majority of the representatives.
Discharge petitions are often associated with the U.S House of Representatives and used when the committee chair refuses to place a bill or resolution on the Committee's agenda which results to the bill being unreported and not subject to the scrutiny of the House. Discharge petitions requires the signatures of 218 members representing the absolute majority of the House members.
The threat from acid deposition has been steadily increasing in the 21st century because of the increase in the number of industries during this period. The acid particles get trapped in the atmosphere and falls as raid on earth. These acid particles are increasing with the booming of the industrial sector.
Someone else already asked this question and it got a lot of good reviews.