global warming is cause by humans

first of all let me proof that global warming is happening . The 10 indicators are: Land surface air temperature as measured by weather stations. You know all those skeptic arguments about how the temperature record is biased by the urban heat island effect, badly-sited weather stations, dropped stations, and so on? This is the only indicator which suffers from all those problems. So if you"re arguing with somebody who tries to frame the discussion as being about land surface air temperature, just remind them about the other nine indicators. Sea surface temperature. As with land temperatures, the longest record goes back to 1850 and the last decade is warmest. Air temperature over the oceans. Lower troposphere temperature as measured by satellites for around 50 years. By any of these measures, the 2000s was the warmest decade and each of the last three decades has been much warmer than the previous one. Ocean heat content, for which records go back over half a century. More than 90% of the extra heat from global warming is going into the oceans " contributing to a rise in" Sea level. Tide gauge records go back to 1870, and sea level has risen at an accelerating rate. Specific humidity, which has risen in tandem with temperatures. Glaciers. 2009 was the 19th consecutive year in which there was a net loss of ice from glaciers worldwide. Northern Hemisphere snow cover, which has also decreased in recent decades. Perhaps the most dramatic change of all has been in Arctic sea ice. Satellite measurements are available back to 1979 and reliable shipping records back to 1953. September sea ice extent has shrunk by 35% since 1979. Science isn"t like a house of cards, in that removing one line of evidence (eg. land surface air temperature) wouldn"t cause the whole edifice of anthropogenic global warming to collapse. Rather, "land surface warming" is one of more than ten bricks supporting "global warming"; and with global warming established, there is a whole other set of bricks supporting "anthropogenic global warming". To undermine these conclusions, you"d need to remove most or all of the bricks supporting them " but as the evidence continues to pile up, that is becoming less and less likely. now global warming is caused by humans , proofs are - 1.Humans are currently emitting around 30 billion tonnes of CO2 into the atmosphere every year (CDIAC). Of course, it could be coincidence that CO2 levels are rising so sharply at the same time so let"s look at more evidence that we"re responsible for the rise in CO2 levels. When we measure the type of carbon accumulating in the atmosphere, we observe more of the type of carbon that comes from fossil fuels (Manning 2006). This is corroborated by measurements of oxygen in the atmosphere. Oxygen levels are falling in line with the amount of carbon dioxide rising, just as you"d expect from fossil fuel burning which takes oxygen out of the air to create carbon dioxide (Manning 2006). Further independent evidence that humans are raising CO2 levels comes from measurements of carbon found in coral records going back several centuries. These find a recent sharp rise in the type of carbon that comes from fossil fuels (Pelejero 2005). So we know humans are raising CO2 levels. What"s the effect? Satellites measure less heat escaping out to space, at the particular wavelengths that CO2 absorbs heat, thus finding "direct experimental evidence for a significant increase in the Earth"s greenhouse effect". (Harries 2001, Griggs 2004, Chen 2007). If less heat is escaping to space, where is it going? Back to the Earth"s surface. Surface measurements confirm this, observing more downward infrared radiation (Philipona 2004,Wang 2009). A closer look at the downward radiation finds more heat returning at CO2 wavelengths, leading to the conclusion that "this experimental data should effectively end the argument by skeptics that no experimental evidence exists for the connection between greenhouse gas increases in the atmosphere and global warming." (Evans 2006). If an increased greenhouse effect is causing global warming, we should see certain patterns in the warming. For example, the planet should warm faster at night than during the day. This is indeed being observed (Braganza 2004, Alexander 2006). Another distinctive pattern of greenhouse warming is cooling in the upper atmosphere, otherwise known as the stratosphere. This is exactly what"s happening (Jones 2003). With the lower atmosphere (the troposphere) warming and the upper atmosphere (the stratosphere) cooling, another consequence is the boundary between the troposphere and stratosphere, otherwise known as the tropopause, should rise as a consequence of greenhouse warming. This has been observed (Santer 2003). An even higher layer of the atmosphere, the ionosphere, is expected to cool and contract in response to greenhouse warming. This has been observed by satellites (La"tovi?ka 2006).