You are here: Home

Search results

114 items matching your search terms.
Filter the results.
Item type










New items since



Sort by relevance · date (newest first) · alphabetically
Milankovitch Cycles
What are Milankovitch Cycles? Natural global warming, and cooling, is considered to be initiated by Milankovitch cycles. These orbital and axial variations influence the initiation of climate change in long-term natural cycles of 'ice ages' and 'warm periods' known as 'glacial' and 'interglacial' periods. Our current climate forcing shows we are outside of that natural cycle forcing range.
Located in Projects & Resources / Environment / Global Warming
Station Drop Out
Many in the denialist camp like to talk about the fact that many temperature reading stations were taken out, and that is why the temperature readings showed global warming. But in reality, this is "Pure disinformation". According to Gavin Schmidt (NASA/GISS) "You can do the same analysis with only stations that remained and it makes no difference."
Located in Projects & Resources / / Global Warming / Myths vs. Facts: Global Warming
Rich document Security Implications
What does global warming mean for National Security? The following reports include the Department of Defense, The Center for Strategic & International Studies, The Center for Naval Analysis, and the German Advisory Council. A report from authors including former CIA Director R. James Woolsey; Jay Gulledge, Ph.D., is the senior scientist and program manager for science and impacts at the Pew Center on Global Climate Change and John Podesta, president and CEO of the Center for American Progress outlines three case scenarios and their impacts for national security.
Located in Projects & Resources / Environment / Global Warming
Solar Influence
Observations of sunspots began in the time of Galileo, about 400 years ago. Heinrich Schwabe recognized the 11.1 year solar cycle average in 1843. Science is working to improve our understanding of solar activity but beyond 400 years it becomes increasingly speculative.
Located in Projects & Resources / Environment / Global Warming
CO2 Lag
Does CO2 Lag behind warming and climate change in the natural cycle? Yes. Is it lagging today? No. CO2 normally lags in the natural cycle unless some abnormal perturbation occurs. If we were in the natural cycle, CO2 levels would be around 280ppm. We are now over 387ppm and therefore CO2 is now leading in our current warming scenario, above natural cycle.
Located in Projects & Resources / / Global Warming / Myths vs. Facts: Global Warming
Troposphere Not Warming
This is a common denialist/skeptic meme. The reality is that while there are significant complexities in the tropospheric measurements and models, homogenized analysis indicates that the troposphere is doing what is expected of it in accord with the various models and general expectations.
Located in Projects & Resources / / Global Warming / Myths vs. Facts: Global Warming
Models Can Be Wrong
It's a common mistake people make... the point is not that models 'can' be wrong. The point is models are 'always' wrong. But that does not mean that they are not relevant and useful for understanding how things work.
Located in Projects & Resources / / Global Warming / Myths vs. Facts: Global Warming
Rich document application/vnd.symbian.install Global Surface Temperature
NCAR/UCAR, NCDC, and NASA GISS Analysis: The current analysis uses surface air temperatures measurements from the following data sets: the unadjusted data of the Global Historical Climatology Network (Peterson and Vose, 1997 and 1998), United States Historical Climatology Network (USHCN) data, and SCAR (Scientific Committee on Antarctic Research) data from Antarctic stations. The basic analysis method is described by Hansen et al. (1999), with several modifications described by Hansen et al. (2001) also included. Modifications to the analysis since 2001 are described on the separate Updates to Analysis.
Located in Projects & Resources / Environment / Global Warming
Global Warming Natural Cycle
The idea that Global Warming is a natural cycle is well understood from paleo data covering the past 1 million years. Is there a difference between current climate, and the natural cycle? For the past million years the natural climate has oscillated between warm periods and ice ages. This shifting in and out of warm periods and ice ages is correlated strongly with Milankovitch cycles. In order to understand the difference between natural cycle and human-caused/influenced global warming, one needs to consider changes in radiative forcing and how this affects systems on Earth such as the atmosphere, vegetation, ice and snow, ocean chemistry and ocean heat content overturn cycles and related effects. The current radiative forcing levels are clearly outside of the natural cycle range.
Located in Projects & Resources / Environment / Global Warming
Medieval Warm Period
Was the earth warmer during the 'Medieval Warm Period' than now? No. Regional temperatures do not represent the global temperature. The Medieval Warm Period (MWP) temperature graphs that people use to claim otherwise, do not represent the global average temperature.
Located in Projects & Resources / / Global Warming / Myths vs. Facts: Global Warming