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Truthout: Getting to 350: What It Will Take to Fix Global Warming

"We can build machines to extract CO2 directly from the air. Even with maximum CO2 removal by improved farming and forestry, and even with rapid, steady decreases in fossil fuel emissions, CO2 would still exceed 350 ppm in year 2100, threatening civilization. Therefore, direct removal of CO2 from air is essential, Hansen calculates."

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