The effectiveness of the Kyoto Protocol was severely limited when ____ refused to ratify the treaty.

Question

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The United States, as one of the largest emitters of greenhouse gases at the time, refused to ratify the Kyoto Protocol, which significantly weakened its effectiveness. Without the participation of the US, the treaty's impact was greatly reduced, and other countries like China and India argued that they should not be expected to reduce their emissions if the US was not doing so as well.

The Effectiveness of the Kyoto Protocol Was Severely Limited When