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Natural and Man-made things warn for saving the life and future of the human. Few of them warn of climate change where people are living and few things warn unusual act by the human which is not in favour of climate as well as the human itself. There are many things, indicators, widgets, and devices that help human and tells in advance what is good for the human being. Natural Things 1. Global Warming Global warming is also an indicator of climate change which directly affects human. The Global atmospheric temperature warns human to take measures to control the atmospheric temperature. 2. Greenhouse Effect This increase in heat is called the greenhouse effect. A greenhouse gas is a gas that absorbs infrared radiation (IR) that comes from the sun rays and diffuse heat in all directions. The greenhouse gases, listed in order of abundance, include water vapour, carbon dioxide, methane, nitrous oxide, ozone, and any fluorocarbons. 3. Increasing Seawater Level