Friends of the Earth Cymru are holding an event in Cardiff encouraging people to show opposition to so-called 'fracking' in Wales.
It's one of 18 events taking place all over Wales.
The organisation says more than a million people in Wales live in areas at risk from the process used to exploit gas and oilf rom shale rock.
'Fracking' involves drilling down before fracturing layers of rock using a pressurised liquid.
A report last month says shale gas represents an opportunity for Wales, but that it must not come at the expense of Wales's natural environment.
More top news
Rain clipping the far north through the evening but elsewhere staying dry with some sunny spells.
Public Health Wales figures show 25 more cases of the virus have also been confirmed.
Photos taken on Saturday morning show Roald Dahl Plass strewn with empty beer bottles and discarded canisters of laughing gas.