Other factors don&#x27;t contribute much. It&#x27;s real, it&#x27;s human made and dangerous:<p><a href="http:&#x2F;&#x2F;www.bloomberg.com&#x2F;graphics&#x2F;2015-whats-warming-the-world&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.bloomberg.com&#x2F;graphics&#x2F;2015-whats-warming-the-wor...</a><p>The state of CO2: now around 400 ppm, 20 years ago was 350 ppm, and that was already more than during the last 800 thousand years, and now it&#x27;s increasing unbelievably faster:<p><a href="http:&#x2F;&#x2F;assets.climatecentral.org&#x2F;images&#x2F;uploads&#x2F;news&#x2F;11_19_15_Brian_800KDot.gif" rel="nofollow">http:&#x2F;&#x2F;assets.climatecentral.org&#x2F;images&#x2F;uploads&#x2F;news&#x2F;11_19_1...</a><p>(based on <a href="http:&#x2F;&#x2F;cdiac.ornl.gov&#x2F;trends&#x2F;co2&#x2F;ice_core_co2.html" rel="nofollow">http:&#x2F;&#x2F;cdiac.ornl.gov&#x2F;trends&#x2F;co2&#x2F;ice_core_co2.html</a> )<p><a href="http:&#x2F;&#x2F;assets.climatecentral.org&#x2F;images&#x2F;uploads&#x2F;news&#x2F;11_19_15_Brian_CO2MaunaLoa.gif" rel="nofollow">http:&#x2F;&#x2F;assets.climatecentral.org&#x2F;images&#x2F;uploads&#x2F;news&#x2F;11_19_1...</a>