It stands for "alcohol clinical training" when including alcohol, although that is not the most common usage of the acronym. More commonly it would stand for "american college testing".
The Kyoto Protocol is the international treaty that was made by the UNFCC and states that the particles commit to reducing the greenhouse gases that are base on the scientific consensus.
The protocol is based on the principle of common but different responsibility. It enables the individual countries to fight against climate change and obliges them to reduce the carbon emissions owning to their economic developments.