FACTBOX: Which Australian firms are big carbon emitters?

(Reuters) - Australia issues a carbon Emissions Trading System options paper on Wednesday to help the country combat its greenhouse-gas emissions. It is already the world's largest carbon polluter per head of population.

The government says around 1,000 of Australia's biggest polluters will need to buy permits under an ETS, to be introduced by 2010, but it has not yet listed the names of these firms.

Here is a sector-by-sector list of some of the blue-chip companies that may be affected by the new scheme.*

FOOD AND BEVERAGE:

-- Coca-Cola Amatil

-- Foster's Group

-- Goodman Fielder

-- Lion Nathan

ENERGY:

-- Caltex Australia

-- Contact Energy

-- Origin Energy (electricity, LPG, natural gas, appliances)

-- Santos (oil and gas exploration)

-- Woodside Petroleum (petroleum exploration and production)

MINING:

-- Alumina