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

Outline:Most of Pro's case is focused on CO2. I will prove that CO2 as no threatening potential, even when combined with our other emissions. In order to win, Pro must prove that CO2 is a major threat, as that is the core of his argument.Rebuttal I: CO2 Global Warming PotentialPro argues that humans also give off many other emissions. I acknowledged this in my last round and discussed it's potential as well. Those gases have huge GWPs but are simply too small in the scheme of things."Assuming the increase in the other gases ppm were the same proportionately, we would be responsible for an increase of nearly 0.20°F. This leaves 1.33°F left that human's are not responsible for."Men's emissions simply don't account for the number needed to assume the whole of Global Warming is man-made. Methane and Nitrous, as a whole, doesn't match up to CO2 emissions alone. Making up a combined 1.31% of all Global Warming, humans making up 0.113% total (1). As for F gases, they are so few that they, with all their potential, only make up less than 0.072% of all Global Warming Potential. They are all combined to form the Misc section. We see the total GWP of Misc, Methane, Nitrious, and CO2 in a visual display. Pro's numbers are correct, but they only represent what percent of the total MAN-MADE GWP those gases make up. But when compared to the total GWP from both men and nature, it only account for 0.278%. This is far too small to be a threat to the World. I've already discussed this, and will display the chart again.GAS -- GREENHOUSE EFFECT -- HUMAN EFFECTWater Vapor ------ 95.000% -- 0.001%Carbon Dioxide -- 3.618% ---- 0.117%Methane ----------- 0.360 ------ 0.066%Nitrous oxide ------ 0.950% ---- 0.047%Misc ----------------- 0.072% ---- 0.047%Total ----------------- 100% ------- 0.278% 1) http://www.geocraft.com...Rebuttal II: Deforestation and Indirect Emissions.I understand this argument well. I've debated it before. CO2 emissions from Deforestation is calculated into the amount listed above. Making up a pretty percent of our total emissions. Deforestation, however, isn't an issue. US forests are larger today than they were 100 years ago.(2) The US's forest growth is 42% larger than it's forest harvesting. The world replants almost every tree removed, with the UN (apart from the US) replanting 1.7 billion trees (3) and the US replanting 1.5 billion trees a year (4), the world isn't far behind it's deforestation rate. At a total replanting rate of 3.2 billion trees a year + plus ever tree planted by lumber companies. Many lumber company replants trees they cut down to ensure they always have a supply. Forests are not disappearing at close to the rate most people assume they are. It would take over 150 years for the forests in the world to be cut in half, based off US/UN replanting alone. With Lumber Companies replacement programs and all other private replantings, as well has natural Forest Growth, we may never see it at the current rate of deforestation.As for CO2 emitted by Deforestation, it's outwieghed by the amount of CO2 consumed over the lifespan of all the trees we replant. Cutting down a tree and turning it into lumber releases 1,200 lb of CO2. Ever tree we replant consumes 12,000 lb throughout it's life. This adds up, as in one year we will release 2.3 Gigatonnes cutting down trees, but the trees replanted that same year will consume 19 Gigatonnes in their lifes. A mighty profit. After the 88 years it would take to cut down every tree that is alive at this moment, we will have emitted 237.6 Gigatonnes, but the trees we replanted would have consumed a grand 661.17 Gigatonnes by then, after calculating the total consumption of CO2 every year. The first year's trees would consume 6.7 Gigatonnes by then, the next years would consume 6.67 Gigatonnes, and so on. As for ocean pollution, this is true that Ocean Pollution is a bad situation, but Pro hasn't proven that it's enough of a threat to make the Resolution true. CO2 and all it's emittions simply aren't strong enough to support Pro's case and prove the Resolution.CO2, at it's GWP, has far to go before it's a major issue. Until then, Human's aren't leaving around nearly a large enough amount to hurt the environment. Total World Emissions, including humans, only accounts for slightly above 3% of the total Green House Effect. It and every other gas Pro mentioned makes up in total 5%. If you only look at the Man-Made gases, it's only 0.555% of total effect. We know CO2 isn't that bad in the scheme of things because of how CO2 levels were around 7000 PPM in the Cambrian Period, and yet the temperature was only 10ºc higher, showing the CO2 doesn't have nearly the effect Global Warming Alarmists are predicting. Pro's own rebuttal only makes this more clear, as we will see.2) http://forestry.about.com...3) http://www.un.org...4) http://forestry.about.com...Rebuttal III: Global Warming Cycle.Yes, CO2 is 400 PPM now, which is pretty high compared to recent cycles, temperatures are still lower than any other warming period. This is prove supporting my case. This Global Warming Period has the highest CO2 PPM (and I never said we weren't responsible for the increase in CO2, as we are, just that CO2 isn't a huge threat) and yet it is the coldest warming period to date. This is clear evidence that CO2 isn't a threat.I already knew the charts were 50 years out of date, I was hoping Pro would notice, as the charts only proof that while CO2 rises during the warming periods, it doesn't cause the warming, otherwise we would be in the hottest warming period in the last 400,000 years. Looking at the charts again, we see that, at 400 ppm, CO2 is high, but we know Global Temperatures is 1.53°F higher than 1900 at this very moment, which makes it the coldest period. Looking at the charts, we see that the coldest warming period is about 2.2°c warming than the 1950 record, while today isn't even a forth that. "As you can see, CO2 emissions are actually much much higher than they have ever been in natural history - 100 PPMs higher than ever." -ProThis is ignorant of my arguments about how high CO2 was in the Mesozoic and Cambrian Eras. Despite the high amount of CO2, which only looks high compared to recent history, both the Cambrian and current temperatures are well under what people claim they should be. We are colder now than any other warming period in recent history, despite high CO2, because CO2 isn't that big of an issue.As for Pro's R2 points, they are mostly an Argument From Authority, from a group of people who are paid to question how humans effect Global Warming, not how Nature might also effect it.Conclusion:CO2 and all the Gases humans release do not have the power needed to prove Man-Made Global Warming is a threat. As far as numbers and data go, The mass of Global Warming we see is natural, and would happen with or without human involvememt. As said in my R2 case, CO2 has been rising since 9000 years ago, and despite high amounts of it, we still have the coldest Warming Peroid in the last 400,000 years.