ولا ينبغي بتاتاً أن يُتخذ عدم اليقين بشأن بعض جوانب هذه الظاهرة سببا للتلكؤ في العمل.
An international programme of action which was both equitable and efficient required that the world's biggest economies accepted their responsibility and undertook effective measures to substantially reduce their emissions of GHGs.