Targets to reduce Australia's greenhouse gas emissions will require difficult trade-offs on the location of large renewable projects, experts warn.

Unveiling the long-awaited climate targets this week, Prime Minister Anthony Albanese pledged emissions would be cut by at least 62 per cent and up to 70 per cent by 2035.

He described the commitment as responsible and "backed by a practical plan to get there".

Environmental law expert Justine Bell-James said the transition to clean energy outlined by the government will require difficult decisions.

Solar, wind and hydro developments will always have an impact on local ecosystems, she warns, but unchecked global warming would have a much worse effect.

"It's a really complex puzzle," Professor Bell-James told AAP.

"You need to kind of zoom

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