The phrase "tar shale" refers to rocks that contain a type of thick oil called tar. These rocks can be found underground and can be used as a source of fuel.
Sentences with «tar shale»
The horrendously carbon - intensive unconventional fossil fuels, tar shale in the United States and tar sands in Canada, can not be developed. (dirtyoilsands.org)
The carbon emissions from tar shale and tar sands would initiate a continual unfolding of climate disasters over the course of this century. (dirtyoilsands.org)
The second figure shows that if coal emissions were thus phased out between 2010 and 2030, and if emissions from unconventional fossil fuels such as tar shale were minimized, atmospheric CO2 would peak at 400 - 425 ppm and then slowly decline. (giss.nasa.gov)