Coal seam gas–a technology for a green future? Most projections of future energy use include an increasing proportion of natural gas as part of an effort to reduce greenhouse gas emissions. Natural gas is increasingly produced by “fracking”, and has already led to a decrease in US CO2 emissions, but it is a controversial method. Should we allow fracking in order to mitigate greenhouse gas emissions? Is it better for us to use coal seam gas, than directly mine the coal?