Around 200 campaigners are expected to protest outside the Senedd later against so-called 'fracking' in Wales.
Hydraulic fracturing involves pumping high pressure fluids into shale rock to recover gas and oil.
Campaigners 'Frack-Free Wales' say they have "grave environmental concerns" that the methods "are unsafe to our future generations."
They are planning to hand in a letter, addressed to the First Minister Carwyn Jones.
It is thought there is a substantial amount of gas under parts of South Wales.
The most controversial fracking issue here has centred around an application to test drill for shale gas at Llandow in the Vale of Glamorgan.
More top news
A mild day with showers in the west, drier and brighter in the east
A team of experts are calling for people in Wales to take more responsibility over their health. We have a few tips here.
The Football Association of Wales says match fixing is 'quite possibly' the biggest threat to football in Wales.