Legion Troll
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After nearly two centuries of fossil fuel burning, concentrations of carbon dioxide in the atmosphere have reached 400 parts-per-million, especially boosted by the seemingly ever-accelerating amount of combustion in the last few decades, according to the World Meteorological Organization.
Atmospheric CO2 concentrations of 0.04 percent may not seem like much but it is enough to have already raised average global temperatures by a full degree Celsius, according to the U.K.'s Met Office, with more warming on the way as the greenhouse gas lingers invisibly in the atmosphere, trapping heat, or mixing into the ocean, rendering waters more acidic.
The world has not seen CO2 concentrations this high in hundreds of thousands of years. Roughly 35 billion metric tons of CO2 are spewed into the atmosphere each year.
The waters of the global ocean have become 30 percent more acidic in the last few decades.
2015 is likely to be the hottest year since record keeping began thanks to an El Nino weather pattern that’s taking place in addition to global warming.
The top 10 warmest years have all occurred since 1998, which was the year of the last major El Nino.
http://www.scientificamerican.com/article/record-levels-of-co2-herald-the-future-of-climate-change/