Man-Made global warming exists* and poses a serious threat to humanity.

Final Defense:Defense 1: Global Warming Potential of CO2The Global Warming Potential of CO2 is, simply said, weak. So weak that it does little to affect Global Temperatures even with massive sums of it in the air. Despite how focused we are on CO2, it simply isn't as big a deal to the environment, and history backs this up. At 400 PPM at the present, this should be the hottest Global Warming cycle of all time, but it is the coldest. The two don't correlate well enough. CO2 rises with temperature, but temperature doesn't really rise well with it. Temperatures are actually low. Through out history, CO2 will correlate when temperatures rose, but temperatures didn't follow well when CO2 rose, often well under the CO2 count of that era. This is for the same reason that today is colder than any other Global Warming Cycle. The effect CO2 has on Global Warming is minimal at most, and not qualified as a *threat to humanity*. With a GWP of only 1, history emphasizes the weakness of the gas, while people exaggerate the strength of it. At only 3.6% of the total GWP effect, and humans at only 0.117% of that, human emissions are not a threat to the planet. Defense II: Other Gases and Earth's Sensitivity. All other human emissions are greatly small in comparison to CO2, even with higher Global Warming Potentials. F-gases and other poisonous substances we throw into the air have massive GWPs, but are so small in number, that all put together still only effects 0.072% of the total Greenhouse Effect, and human's are responsible for only 0.047% of that. The gases, all together, contribute only 2% of what CO2 does, and since the evidence and history shows CO2 does little, we can only assume our other gases do much less. Earth's Sensitivity is high, but it is gravely exaggerated upon. History shows that, specifically the Cambrian Era. If Earth's Sensitivity was as high as people claim, and 400 PPM CO2 or anything close to it could cause a major snowballing effect, we would have seen it there. At 7000 ppm, the Cambrian Era should have snowballed into temperatures we can't measure on conventional thermostats. And the sea level would have been well below ours, not 30-90 meters above. The Snowballing effect simply isn't there, not for CO2 at least. A) DeforestationDeforestation does release a lot of CO2, but this CO2 isn't hidden from view, it is accounted for in every measurement I made. Having done the math, Total CO2 consumption from trees we replant over the next 88 years is well above 3x the amount we produce through deforestation based on an average annual consumption per tree. .. Even if CO2 Consumption was half as effective the whole of the next 88 years, we would still see it 100 gigatons above emissions (a decrease of 213 ppm worth, or 850 ppm at the original measurements). Defense III: Global Warming CycleThe past millions of years have seen a continuous cycle of Global Warming. Each one hotter than today's, despite lower CO2 emissions. Assuming Humans are responsible for Global Warming is more Post Hoc, since our emissions are minimal in effect. This Global Warming Cycle has been going on long before human's began throwing out emissions, and CO2 has been rising since 9,000 years ago. That being said, it's more likely that natural CO2 emissions having been growing as well, otherwise CO2 ppm should have been going down until the Industrial Age. Assuming CO2 causes most Global Warming is ignorant of the history of Global Warming, where high amounts of CO2 never correlated well with equally high temperature, as is the same today. At least, not in a way that supports the notion that CO2 plays a major part in increasing temperatures. The Global Warming Cycle in the past 400,000 years has never seen CO2 PPM this high before, being 25% higher than any other example. Temperature is, however, the coldest. This is because CO2 has never been a major part of Global Warming. Correlating with it, but not causing it. The Global Warming Cycle of the past 400,000 years prove this, as well as Global Warming in the deep past. In the Cambrian Era and Mesozoic Era, CO2 was wildly above ours, but temperature was't proportionately as high. The Current Global Warming cycle is entirely natural. Looking back at the charts, we should be in a warming cycle. Saying Global Warming is mostly man-made is ignorant of the fact that this cycle looks just like every cycle. Final Conclusion: Human emissions contribute little to Global Warming, which is evident in how cold our current cycle is. CO2 has never increased temperatures to any proportionate amount, and the Earth Snowball-Sensitive effect just isn't present in any historical data. Pro has dropped the case of CO2 consumption from tree replanting. I have proven how: CO2 has a minimal effect, even when compiled. Deforestation isn't nearly the issue it's exageratted to be. The Earths Sensitivity isn't nearly intense enough to cause a massive Snow-balling effect. We are colder than any other Warming Period. How natural Global Warming is. I have proven that CO2. and man-made gases, simply contributes little to nothing, as history and even today's chart prove. Thank you for this debate, Pro.