A key Labor climate adviser has warned the government against setting its 2035 emissions target too high, arguing that any goal north of 60 per cent will require a major expansion of emissions reductions in the transport, industrial and agricultural sectors.

Frank Jotzo, the author of a forthcoming Labor-commissioned report into a potential carbon border tax, said excessively ambitious policies being proposed by some climate groups would be impractical and easily undermined by opponents of change.

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