Permafrost: When frozen soil, constituting about 25% of the Northern Hemisphere, increases, it keeps in the carbon and methane gases. So, while you may be thinking how it can be global warming when you’re still freezing in Tibet, the permafrost is actually leaking carbon into the earth’s atmosphere. While scientists cannot stop permafrost from emitting these gases, the earth’s melting icecaps at incredibly fast rates, are cause for concern.