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Hawaii’s Mauna Loa Observatory has reported that worldwide carbon dioxide levels reached a new record high in April, hitting 410.31 parts per million (ppm). This is the highest concentration of this greenhouse gas seen over the course of human history–and prehistory, for that matter–as the Earth’s atmosphere hasn’t seen CO2 levels this high in well over 800,000 years, and possibly as long as 20 million years.
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A new study published in the journal Nature Geoscience has found that the goal of the Paris climate accord of keeping global warming levels below 2ºC (3.6ºF) may be easier to achieve than originally anticipated, allowing humanity a much larger carbon budget to work with. One of the major reasons certain parties have rejected the Paris Accord was the perceived difficulty in attaining that goal, but this new finding, if correct, should help encourage more action in regards to what we need to do to curtail global warming.
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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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A new study that employs global positioning system measurements has revealed that the Greenland ice sheet is melting much faster than what previous estimates indicated, by roughly 7.6 percent. Previous estimates pegged the amount of ice loss between 2003 and 2013 at 2,500 billion tons, but the new study corrects this to 2,700 billion tons — a major factor in estimating the rate of future sea level rise.
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