Global warming exists and it is man made.

For this round I'm gonna present all my major evidence, and then in the next speech try and piece the puzzles together in context of my opponent. But a lot of my evidence is directly responsive anyway. 1. No credible evidence for anthroprogenic warming Singer, professor at George Mason and director of th Center for Global Food Issues at the Hudson Institute: The Earth has recently been warming. This is beyond doubt. When we correct the thermometer records for the effects of growing urban heat islands and widespread intensification of land use, and for the recently documented cooling of the Antarctic continent over the past thirty years, overall world temperatures today are only modestly warmer than they were in 1940, despite a major increase in human CO2 emissions. The real question is not whether the Earth is warming but why and by how much. We have a large faction of persons who say the warming is man-made, and dangerous. They say it is driven by releases of greenhouse gases However, they don't have much evidence to support their position-only (1) the fact that the Earth is warming, (2) a theory that doesn't explain the warming of the past 150 years very well, and (3) some unverified computer models. Moreover, their credibility is seriously weakened by the fact that many of them have long believed modern technology should be discarded whether the Earth is warming too fast or not at all. 2. Sun is main cause of warming - Mars proves National Post: Global warming extends to Mars, where the polar ice cap is shrinking, where deep gullies in the landscape are now laid bare, and where the climate is the warmest it has been in decades or centuries. NASA's findings in space come as no surprise to Dr. Abdussamatov at Saint Petersburg's Pulkovo Astronomical Observatory. Pulkovo -- at the pinnacle of Russia's space-oriented scientific establishment -- is one of the world's best equipped observatories. Heading Pulkovo's space research laboratory is Dr. Abdussamatov, one of the world's chief critics of the theory that man-made carbon dioxide emissions create a greenhouse effect, leading to global warming. "Mars has global warming, but without a greenhouse and without the participation of Martians," "These parallel global warmings -- observed simultaneously on Mars and on Earth -- can only be a straightline consequence of the effect of the one same factor: a long-time change in solar irradiance." The sun's increased irradiance over the last century, not C02 emissions, is responsible for the global warming we're seeing, says the celebrated scientist, and this solar irradiance also explains the great volume of C02 emissions. "It is no secret that increased solar irradiance warms Earth's oceans, which then triggers the emission of large amounts of carbon dioxide into the atmosphere. So the common view that man's industrial activity is a deciding factor in global warming has emerged from a misinterpretation of cause and effect relations." Dr. Abdussamatov goes further, debunking the very notion of a greenhouse effect. "Ascribing 'greenhouse' effect properties to the Earth's atmosphere is not scientifically substantiated," he maintains. "Heated greenhouse gases, which become lighter as a result of expansion, ascend to the atmosphere only to give the absorbed heat away." 3. Co2 is corrolation not causation Singer [2]: Despite the huge clouds of greenhouse gases emitted from human activities, provides evidence that the human greenhouse effect must be so small that it presents little threat to the planet or its people. This is especially true if the current CO2 levels have already used up almost all of that trace gas's ability to heat our planet. (Each additional increment of CO2 causes less warming.) Recent research has given us a much clearer picture of the global interaction between temperature and CO2: First, satellite and high-altitude weather balloon data confirm that the lower atmosphere is not trapping lots of additional heat due to higher CO2 concentrations. It is hard to know how fast the Earth's highly variable surface is warming, but it is warming faster than the lower atmosphere where the CO2 is accumulating. This is strong evidence that CO2 is not the primary climate factor. Second, the Antarctic ice cores tell us that the Earth's temperatures and CO2 levels have tracked closely together through the last three ice ages and global warmings. However, CO2 has been a lagging indicator, its concentrations rising about eight hundred years after the temperatures warm. This is additional evidence that CO2 is not the forcing agent in recent global climate changes.