What is methane, how much does Australia emit, and will we sign the pledge?

Methane is a powerful greenhouse gas. Over a 20-year period it causes 82 times as much heating of the atmosphere as carbon dioxide. Photograph: David Goldman/AP

There’s been much talk of the potent greenhouse gas methane this week – from global pledges to burping cows and expensive barbecues.

The Albanese government is considering joining 120 other countries that have already pledged to cut methane emissions by 30% by 2030.