Even in a landfill, this nappy will break down faster than a conventional one, although it will still emit methane, a significant greenhouse gas.

The bricks will be manufactured using wood-chip waste, which would otherwise rot and emit methane gas into the atmosphere.

Hope they don't emit methane.

Improperly operated flares may emit methane and other volatile organic compounds as well as sulfur dioxide and other sulfur compounds, which are known to exacerbate asthma and other respiratory problems.

In addition, as it rots it emits methane, 'a greenhouse gas that's more than 20 times more potent than carbon dioxide'.