The following article is based on a presentation by Aaron Roden of Sydney West Socialist Alliance.
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Let’s start with the climate science. The CSIRO website offers some data. Over the past century the global average surface temperature has risen by 0.74 ºC. In Australia there has been a 0.9ºC warming since 1950. Average northern hemisphere temperatures during the second half of the 20th century were the highest of any 50-year period in the past 1300 years.