Final answer:
The Kyoto Protocol was intended to reduce greenhouse gases on a global scale, with countries committing to emission reduction targets, but faced challenges such as non-ratification by the US and China, and a lack of agreed upon future benchmarks.
Step-by-step explanation:
The true statement of the Kyoto Protocol is that it was intended to reduce greenhouse gases on a global scale. The protocol, formed under the United Nations Framework Convention on Climate Change in 1997, set legally binding targets for reducing emissions for participating countries, although not all countries agreed to or met the targets.
While some individual countries exceeded their goals, the global effort to reduce greenhouse gas emissions has faced challenges due to lack of consensus on timelines and benchmarks for reduction, with key nations like the United States and China not ratifying the agreement due to various concerns including economic impact and growth.