In late October, Exxon Mobil CEO Rex Tillerson announced that his company is backing the concept of a carbon tax, saying that climate change brings real risks, and serious action is required to mitigate them.

“We have long used a proxy cost of carbon… there’s a range depending on the country, depending on the tax that we think would be appropriate,” Tillerson explained at the Oil & Money conference in London. “We’re trying to influence and inform people and business on the choices they make.”
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While the idea that human-generated carbon emissions are nothing new, and the impact of greenhouse gasses on global warming have been evident for quite some time, there has been a great deal of debate over exactly how much humans have been contributing to the issue, as opposed to the natural portion of the warming cycle that the planet has been undergoing since the start of the Holocene era. But now a new study seems to have quantified our contribution — and it isn’t insignificant.
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