<p>Hi Smallz, I’m just a noob who hasn’t even figured out how to quote posts yet, but wanted to point something out about NASA’s data. It’s been a long time since I saw it so I may be a little off on the exact numbers.</p>
<p>NASA’s graphs show global temperature rising at a slow but steady rate as far back as we have data, or around 1880. The global mean temp varies from year to year, but overall there was steady rise from 1880 to 1920 of about half a degree Celsius. After that, the temperature varies widely but on average remains at the 1920 mark. There is a sudden drop in 1978, but that is due to the switch from ground to satellite measurements. The temperature begins to rise again in the late 90’s, so that the most recent measurement I’ve seen showed us about .4 degrees above the 1920 level.</p>
<p>OK. So overall the global mean temperature shows a rise from 1880 to 1920, then varies above and below the 1920 level until the 90’s, when it begins rising again. But is this caused by human-produced carbon emissions?</p>
<p>The overall carbon level in the atmosphere have been measured at the Mauna Loa observatory since 1900. From 1900 to 1940 it increased only slightly (290 PPM to 300 PPM). In the 40s it began an rapid increase, hitting 320 PPM by the 60s, 340 by the 80’s and was nearing 380 by the year 2000.</p>
<p>Compare this to the temperature. The GMT went up while the carbon held steady, and vice versa. This is WAY more complex than human greenhouse effect.</p>
<p>Thanks for reading this! Any comments or criticism are appreciated, but insults will be ignored.</p>