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Carbon Pollution Touched 800,000 Year Record in 2016, WMO Says (bloomberg.com)
Carbon dioxide levels surged to their highest level in at least 800,000 years because of pollution caused by humans and a strong El Nino event, according to the World Meteorological Organization. From a report: Concentrations of the greenhouse gas increased at a record speed in 2016 to reach an average of 403.3 parts per million, up from 400 parts per million a year earlier, the WMO said in a statement on Monday warning of "severe ecological and economic disruptions." The WMO said the last time the Earth had a comparable concentration of CO2s, the temperature of the planet was 2 degrees to 3 degrees Celsius warmer and sea levels were 10 meters to 20 meters higher than now.
The runaway effect needs something like 3000ppm of CO2. This is not going to happen. What you need to fear is the sea level rise, desertification, extreme weather and your neighbors who will gladly kill you once they have nothing to eat.