The Hills Shire Council will hold several events during the week, including composting displays and workshops.

Residents will also have the chance to see what happens to the green lid bin after it leaves the kerb.

The council will hold a free bus tour of the WSN Garden Organics Processing facility at Eastern Creek on May 5.

The bus will leave at 10am and return at 1pm.

Bookings are essential.

Details: Council's Waste Team on 9843 0505.

Council officers will be at Stockland Mall Baulkham Hills on May 3 and Castle Towers May 4 to answer questions about composting, worm farming and waste minimisation.

A free composting and worm farming workshop will be held at the Community Environment Centre, Annangrove Rd, Annangove from 11am to 1pm on May 7 when residents will be able to learn all

about composting and worm farming.

Details and bookings essential on 9843th0505.

The council's Waste Education officer Shaun Hunt said about 90 per cent of greenhouse gas emissions from landfill were the result of decomposing organic materials, which could be reduced by composting

garden materials and food scraps.

``Up to 50 per cent of the waste from council's red bins could be diverted from landfill by composting or worm farming,'' he said.

``About 60 per cent of the rubbish Australians put in the everyday mixed-waste garbage bin could be put to better use in the garden as compost and mulch.

``A huge amount of organically active material burned anaerobically (without air) in landfill causes more than three per cent of Australia's annual greenhouse gas emissions by producing methane.

``If properly composted, the same organic waste can be reduced in yet another way, by sinking carbon back into the soil.''