Que si , que todo el calentamiento esta "tuneado" , y en realidad vivimos en la era de hielo.
Pues claro que está tuneado,la propia NASA o quien sea cambia sus datos con el tiempo alegando homogeneizaciones y chorradas varias que en realidad enmascaran lo que hacen: manipular los datos.
Yo lo que no quiero es que se tome por tonta a la gente y más cuando toda esta milonga la estamos pagando todos de nuestros bolsillos. A mi me da igual que el planeta se caliente o se enfríe,no pienso que vayamos a morir por ello como venden muchos por ahí,lo venden a buen precio eso sí.
La Nasa , no "tunea" lo datos , "tunear" seria aplicar ajustes y metodos a los datos , sin un fundamento que lo sustente detrás , y aquí se ha echo todo lo contrario , se ha fundamentado cada cambio que se ha realizado con el tiempo , en cada nueva versión y el porque de la necesidad de aplicar dichos cambios , se trata de mejorar y corregir sesgos propios de lo datos duros originales , y que están disponibles para cualquiera..Toda la documentación de estos cambios esta accesible en le WEB.
http://data.giss.nasa.gov/gistemp/history/Dejo breve sumario.
We have gone through the archives to show exactly how these estimates have changed over time and why. Since 1981 the following aspects of the temperature analysis have changed:
-The simple procedure used in 1981 was refined as documented in Hansen and Lebedeff (1987), using 8000 grid boxes to allow mapping and analysis of regional patterns.
-Surface air temperature anomalies above the ocean were estimated using sea surface temperatures from ships and buoys starting in 1995 as documented in Hansen et al. (1996).
-Starting in the 1990s, the methodology took into account documented non-climatic biases in the raw data (e.g. station moves) and eliminated or corrected unrealistic outliers (Hansen et al., 1999).
-Areas with missing data were filled in — using means over large zonal bands — rather than restricting the averaging to areas with a defined temperature change (Hansen et al., 1999).
-A method was devised in 1998 and refined in 2000 to adjust urban time series to match the long term mean trend of the surrounding rural stations, Hansen et al. (1999, 2001). This adjustment uses the full data series to make the best estimate of the rural/urban difference and so can change as the time-series are extended (and more data comparisons are available). Starting in 2010 night-light radiance rather than population data were used to classify stations (Hansen et al., 2010).
-Usage of water temperatures as proxy for air temperatures was more accurately restricted to areas without sea ice starting in April 2006.
Additionally, the amount of raw data and its quality have also increased as more data has been digitized and quality controlled. The station data sources over the years were:
Monthly Climatic Data of the World (MCDW) — about 1000 stations (1981)
MCDW and data provided by NCAR and NOAA — 2200 stations (1987)
NOAA/NCDC’s GHCN v2 — 7200 stations (1999)
NOAA/NCDC’s GHCN v2 and adjusted USHCN (2000)
GHCN v2 and adjusted USHCN and SCAR (2/2005) — better Antarctica coverage
Homogenized GHCN v3.1 and SCAR (2011)
Homogenized GHCN v3.2 and SCAR (9/2012)
Planned for 2016: GHCN v4 — 26,000 stations