Major reforms to Australia's environment laws will not be split up despite demands from the opposition, with debate over the contentious changes set to dominate the week in parliament.

Environment Minister Murray Watt plans to introduce the overhaul into parliament on Thursday.

He has been negotiating with the coalition and the Greens to try and get the legislation through the Senate, where Labor doesn't have the numbers on its own.

The changes aim to better protect natural sites, while also speeding up approvals for major housing, energy and infrastructure projects, which the government says are currently bogged down in red tape.

But the opposition wants the bill split in two, so elements which are considered more pro-business can be dealt with first.

Liberal leader Sussan Ley and en

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