Definition: In this task, you are given a news article. Your task is to classify the article to one out of the four topics 'World', 'Sports', 'Business', 'Sci/Tech' if the article's main topic is relevant to the world, sports, business, and science/technology, correspondingly. If you are not sure about the topic, choose the closest option. Note that URLs in the text have been replaced with [Link].
Input: Pakistan ratifies Kyoto Protocol BUENOS AIRES: Pakistan has ratified the Kyoto Protocol on Climatic Change, Environment Minister Malik Khan said on Thursday. He said that Islamabad has notified UN authorities of ratification, which formally comes into effect in February 2005.

World