This report covers the activities and performance of the Katowice Committee of Experts on the Impacts of the Implementation of Response Measures in 2025. It contains information on the 12^th and 13^th meetings of the Committee and possible recommendations for consideration by the forum on the impact of the implementation of response measures with a view to the forum recommending actions to the Conference of the Parties at its thirtieth session, the Conference of the Parties serving as the meeting of the Parties to the Kyoto Protocol at its twentieth session and the Conference of the Parties serving as the meeting of the Parties to the Paris Agreement at its seventh session.