Next time some one tells you that volcanoes cause more global warming than burning fossil fuels, show them this little graphic. Then politely inform them that before the Industrial Revolution just over 200 years ago, there weren't any CO2 emissions from the burning of fossil fuels. Then tell them that over the past 200 years, we have cut down almost 50 percent of the worlds forests.
Then ask them again, "Do you really believe humans cannot have a lasting and dangerous effect on the planet's atmosphere?"
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