Thank you for this info.

From "...กระบวน การใช้แรงดันของเหลว(ไฮโดรลิค)กระแทกชั้นหิน (frackling) บ่อน้ำมันเก่าให้แตก เพื่อแยกเก็บแก๊สก้าวไปในไกลในสหรัฐฯ ทำให้จีนกำลังวางแผนทดลองผลิตในประเทศบ้าง..." I googled "fracking in usa" and read a few pages.

The problems with fracking are the breaking of earth layers and the use of "hazardous chemicals" to drive up gas. The gas can permeate the ground and leak every-which-way (fracking=fracturing=blasting without knowing what and where things break), chemical solutions can then permeate and leak into fractures and underground water sources (springs and underground rivers) making the water poisonous and not usable by any life form.

We may be burning gas quite cleanly. But, we are killing off lives on the planet getting the gas! We can ferment rubbish to generate methane gas to make electricity and clean the planet.

Smart use of "renewable energy" will create "jobs" and save our world.