Scientists are in consensus that human activities like deforestation and the burning of fossil fuels have contributed to global warming. Much of this impact may be irreversible, however, because greenhouse gasses last so long in the atmosphere–more than two hundred years, in the case of carbon dioxide. This means that even if all emissions ceased this instant, current (elevated) rates of greenhouse gasses would still persist, continuing to raise the planet’s temperature. This should not discourage people from making real changes to limit their emissions; instead it should be enough to convince governments and individuals that we must act at once.
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