You seem to be touching on conspiracy theories to pad your...

You seem to be touching on conspiracy theories to pad your argument.

As for different environments resulting in changes to temperature records over time at those locals, this is why there are standards set up to record temperatures and processes to check and adjust recorded temperatures where needed.

Previously been claimed the BOM altered temperature data as an attempt to discredit the data from BOM. The reality is, it is adjusted to maintain the integrity and accuracy of the data, from sources that did not adhere to set standards of recording data.

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Station siting

Station locations cover a wide range of environments; from open desert areas to the top of mountains, urban streets, offshore islands and Antarctic ice sheets. The characteristics of these sites can influence the observations being made. For example, consider an open area surrounded by trees. This is likely to make a very good rainfall site, because the trees would help to reduce the wind turbulence above the rain gauge which can affect the amount of rain being recorded. However, it is not likely to be a good wind observation site. While siting guidelines exist for the location of instruments to minimise impacts of the surrounding terrain, the final location is often a compromise between a wide range of factors.


http://www.bom.gov.au/climate/data-services/about-data-observations.shtml


GUIDELINES FOR THE SITING AND EXPOSURE OF METEOROLOGICAL INSTRUMENTS AND OBSERVING FACILITIES.
1997
http://www.bom.gov.au/climate/cdo/about/observation_specification_2013.pdf