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
Motorbike rider Kara Rann has died after crashing during competition at Pembrey Racing Circuit in Carmarthenshire
David Cameron promises 'to bring fairness to our constitution' but fails to spell out what that will mean for Wales
There will be some patchy rain but many areas will be dry for much of the time.