Senators questioned federal government officials on Australia's climate policy on Monday after the Nationals agreed to a 2050 target for net zero emissions at the weekend.
The latest round of Senate estimates began following a turbulent two weeks as the junior Coalition partner took a tortuous path on the climate target.
As Prime Minister Scott Morrison prepared to attend the Glasgow COP26 summit this week, the government faced questions over its carbon emissions targets and the details of its secret agreement with the Nationals.
Estimates hearings this week started with committees digging into the environment and energy, national security, parliamentary and infrastructure portfolios.
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