Fracking has led to an increase in truck traffic, one of the reasons for worsening trends on air quality in areas with oil and gas drilling.
AP Photo/Charles Rex Arbogast
The fracking boom has led to a large increase of hydrocarbon emissions in rural areas, reversing some regional air toxics trends.
There are indications shale gas may be present in South Africa’s Karoo.
South Africa's Karoo region potentially holds shale gas that could transform the energy economy of the country. But given the uncertainties around exploration what's the next logical step?
Why protesters should think about putting their feet up.
Can we mitigate the risks associated with fracking?
From crossing a road to fracking for oil, everything has inherent risks. At best, we can only aim to agree that, on balance, they are contained and justified.
South Africa’s Karoo region, in the south west of the country, is thought to have significant reserves of shale gas.
Shale gas holds considerable advantages. But there are still a number of uncertainties around whether South Africa is ready for such a bold step.
Florida’s unique geology means alternative fracking methods would be used, but can aquifers be safely separated from injection wells?
There's a debate over whether fracking should be introduced into Florida, a state with a unique geology and hydrology that introduces a long list of environmental concerns.
Fracking in the US has relied on chemicals linked to a range of health problems but the industry claims UK operations would be far safer.
A fracking well in Pennsylvania, which saw rapid and sometimes-problematic spread of natural gas development.
Different states and countries with shale gas can benefit from the mistakes made by other regions that rushed into fracking. Here’s one state’s plan.
A fracking well injects large volumes of water, chemicals and sand to fracture rock.
Fracking fluids in Marcellus shale have contaminated groundwater but new study finds that the source is likely from surface spills, not leaks from underground wells.