I'm self-employed <a href=" http://www.st-cuthbertmayne.co.uk/azithromycin-asthma-uk.pdf#deliver ">buy azithromycin over the counter uk</a> Natural gas, the cleanest of the hydrocarbon-based fuels, has long been a primary choice for heating and power generation, as well as an essential raw material, or “feedstock,” for a vast range of chemistry-based products, including every kind of plastic, synthetic cloth and high-tech composite materials. When gas supplies came under pressure in the late 1990s, the chemical industry &#8212; and most other energy-dependent U.S. heavy manufacturers &#8212; were hard hit.