Original sentence: Because of this many critics and environmentalists question the value of the Kyoto Protocol.Supported of Kyoto have expressed hope that it is a first step in addressing environmental issues
Edited sentence: Because of this many critics and environmentalists question the value of the Kyoto Protocol should the negotiations fail to produce deeper cuts in the future.Proponents note that Kyoto is only intended as a first step, as requirements to meet the UNFCCC will be modified until the objective is met, as required by UNFCCC Article 4.2(d)