The Coalition says it cannot support once-in-a-generation reforms to Australia's environment laws in their current form, as deep negotiations on the legislation begin.

The massive 1,500-page package was introduced to parliament on Thursday, after months of meetings between Environment Minister Murray Watt and stakeholders to rewrite reforms that failed to win support last term.

From the beginning, Senator Watt has said that nobody would get everything they wanted — including himself, suggesting that the federal government would be open to amendments in order to see the laws passed.

Speaking on ABC Insiders, Senator Watt said he was "very confident" the bill could be passed with the support of either the Coalition or Greens.

"What we're seeking to do here … is achieve a balanced package

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