Instruct: Classify the given comments as either toxic or not toxic
Query: Too bad, as usual no details.  All things being equal, natural gas is the cleanest of the fossil fuels.  However, if the economics aren't there, then wait till they are.
NOTE:  fracking in folded formations (e.g. foothills) has not shown the same negative issues as fracking in flat formations.  The latter experiencing gas and chemical leaks into water supplies and farm lands.