1.   When the supply of sulphate was stopped, methane production returned.

2.   In recent studies, however, we have shown that methane production is more important than previously believed.

3.   Methane production is altered by rainwater, heat and other factors.

4.   Omega also is involved in coal bed methane production in Montana, an extraction method that is opposed by environmental groups.

5.   Scientists working with the northeastern state of Queensland are experimenting with bacteria from the stomachs of kangaroos to find ways to reduce methane production by livestock.