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.
Anti-fracking street stalls and events are taking place across Wales today, with thousands of people expected to join environmental groups demanding that the Welsh Government bans the drilling process.
Friends of the Earth say over a million people in Wales live in areas at risk from the process used to extract shale gas.
They say more should be done to cut energy waste and develop Wales' potential to find cleaner energy sources.
However, The Welsh Government say appropriate safeguards are in place to protect the environment in regards to dealing with natural gas and minerals.
The designer, Dame Vivienne Westwood, is attending an event in Swansea later today called 'We need to talk about fracking.' It's part of a nationwide tour following on from an open letter printed in the Times and signed by over 150 celebrities and scientists calling for more debate on fracking.
There are reserves of shale gas in parts of south Wales and licences for exploratory drilling have already been granted by several councils. The UK government supports the extraction saying it could reduce energy bills and create thousands of jobs.
Fracking - short for "hydraulic fracturing" - involves drilling deep underground and releasing a high-pressure mix of water, sand and chemicals to crack rocks and release gas stored inside.
Environmentalists fear it can cause small earth tremors, water contamination and environmental damage.
Three applications to test drill for gas have been approved by Vale of Glamorgan Council's planning committee.
Bridgend company Coastal Oil and Gas Ltd wants to carry out exploratory tests at three sites at Llandow, Llantrithyd, and near Dyffryn.
The test drilling could then lead to the process of hydraulic fracturing - or fracking - where water, sand and chemicals are pumped into a well to split the rock, and release gas.
Campaigners have raised fears about water contamination, and say even exploratory drilling will damage the countryside with excess noise and traffic.
Supporters say fracking could provide vital affordable energy.
Cliff Patten, Planning Consultant for Coastal Oil and Gas Ltd - whose applications to test drill for gas are being considered by Vale of Glamorgan Council this evening - says the company has drilled six boreholes in South Wales "without any major incidents."
He told our Correspondent Carole Green "this is a fairly ordinary application - hundreds of these have been drilled" throughout the UK.
Anti-fracking campaigners in the Vale Of Glamorgan are tonight demonstrating in Barry, to demand that councillors turn down plans to test drill at three sites.
The Brigend company Coastal Oil and Gas Ltd wants to carry out exploratory tests at locations including Llandow and Llantrithyd. It also has plans to test drill near Llantrisant.
The protest group Villages Against Drilling says exploratory drilling for gas will spoil the countryside, but those in favour dismiss the environmental concerns, saying test drilling is a step on the road to fracking which in turn could provide vital affordable energy.
Campaigners have protested outside the Senedd to voice their concerns against fracking in Wales.
The Welsh Government says we need to look at new ways of sourcing energy. Many of those opposed to fracking say they're concerned about the environmental consequences.
Alexandra Lodge reports.
Hundreds of campaigners are expected to gather outside the Senedd today to show their concerns against so-called 'fracking' in Wales.
'Fracking' is the term given to a technique used to release gas and oil from shale rock. It involves drilling down before fracturing layers of rock using a pressurised liquid.
Anti-fracking groups such say 'this is not an alternative energy source' and that "the money which is being in invested in ever more extremes of energy extraction should now go into clean energy'
The Welsh Government say given the challenges of the energy sector they understand there is a need to look at the potential of this type of energy resource. However, there is also a need to fully consider the impacts on communities and the environment.