Climate change is already a key issue in this campaign after featuring heavily in the Victorian state election and the Wentworth by-election, which stripped the Coalition of its majority.

You ask, we answer Many of you asked about climate change as part of the ABC's You Ask We Answer campaign. Here's some of the audience questions answered in this article: What are the two major parties' policies on climate change and how do they differ? - Valerie

What are the two major parties' policies on climate change and how do they differ? - Valerie What are your specific goals and measures that reduce carbon emissions? - Lynne

What are your specific goals and measures that reduce carbon emissions? - Lynne What are you going to do immediately about reducing emissions and helping to stop climate change? - Coral

What are you going to do immediately about reducing emissions and helping to stop climate change? - Coral What policy will LNP, ALP and the Greens put in place to combat our climate change catastrophe? - Anne

What policy will LNP, ALP and the Greens put in place to combat our climate change catastrophe? - Anne Which party will have the most ambitious and aggressive plan to reduce Australia's carbon emissions? - Stuart

Federal Labor argues the Coalition hasn't taken the issue seriously during its six years in government and that it lacks a credible policy to lower carbon emissions.

The Coalition argues Labor's emission reduction target is recklessly ambitious and that the Opposition has not explained how it will be achieved, and at what cost.

But the electoral significance of this issue does differ from state to state, and seat to seat.

In Victoria, Treasurer Josh Frydenberg is running against an independent in Kooyong who is also a former head of the Clean Energy Finance Corporation.

Former Liberal Julia Banks has also made climate change a key issue in her bid to unseat her former colleague, Health Minister Greg Hunt.

In north Queensland, Nationals MPs are campaigning for the Adani coal mine to be given final state approvals, while further south in the state, more moderate Liberal MPs are worried about an environmental backlash.

Here's where each party stands on the issue of climate change.

Coalition

The Prime Minister has pledged $2 billion for projects that will reduce Australia's carbon emissions.

The Climate Solutions Fund has been rebadged and resold to the public as a practical, solutions based approach to climate change.

Scott Morrison has repeatedly said Australia would meet its Paris commitment of reducing emissions by 26 to 28 per cent by 2030 "in a canter", despite recent government projections casting doubt over that.

Unlike Labor, the Coalition will use so-called Kyoto carry-over credits to achieve that goal.

The Coalition also says $15 billion for renewables will be injected into the national energy market in the next three years.

The Coalition will also invest $1.38 billion into the Snowy Hydro project, making it a key part of its renewable energy push.

This project would multiply generating capacity by 150 per cent and could power 500,000 homes during peak periods.

But the Coalition has walked away from the National Energy Guarantee — a framework to reduce carbon emissions and power prices while ensuring renewables.

Labor

Federal Labor will also throw billions of taxpayer dollars at solar, wind and hydro projects.

A major part of that plan involves rebates given to households and businesses that install batteries to store solar energy.

The Opposition hopes the means-tested $2,000 rebate will help triple the number of homes using batteries for storage at a cost of $200 million.

To help many lower-income households that do not have solar panels, Labor is also promising to expand support for solar installation at a cost of $100 million.

Labor would expand the Turnbull government's safeguard mechanism, forcing about 250 of Australia's biggest polluters to cap emissions.

Labor also wants half of all new cars bought in 2030 to be electric and will give businesses incentives to invest.

Labor has a higher emission reduction target of 45 per cent, which the Coalition argues is too ambitious and irresponsible.

Labor will also adopt the bones of Malcolm Turnbull's National Energy Guarantee, arguing it will give big industry more certainty.

The Clean Energy Finance Corporation will also have its funding topped up to $10 billion.

The Greens

The Greens have the most ambitious climate change policy, calling for 100 per cent of electricity to come from renewables as soon as possible.

The party would make it illegal to dig, burn or ship thermal coal by 2030 arguing it is no longer compatible with human life.

As for a 2030 goal; the Greens are aiming for 90 per cent renewable energy.

The Greens are strongly opposed to the Adani coal mine in Queensland.

The party would also invest $2 billion in a new nature fund that would protect native animals and plants.

The Greens do not support Labor's plan for Australia's biggest polluters to access international carbon markets.

If the party does secure the balance of power in the Upper House, it has vowed to ensure government policies are more ambitious.