They were met with tear gas, sticks and water cannons.
There may well be more natural gas stuck in our shale rock than we ever thought possible – a whole decade's worth.
The protesters chanted slogans against the police chief, General Lotfian, whose officers had abetted the attack by the hard-liners armed with tear gas, sticks and stones.
The future will be a lot warmer if the UK can muster the political will to look to a promising new alternative in energy production– hydraulic fracturing, or "fracking", a drilling technique that releases natural gas stuck in shale formations, opening access to enormous underground reserves.
Some gases stick more than others, and hence travel more slowly, so that the components of the gas sample separate out.
But greenhouse gases stick around anywhere from decades to centuries and therefore their concentrations will stay high for a long time even after we stop emitting them.
Along with the rest of the tech industry, it worked to reduce its emission of fluorinated gases – greenhouse gases that stick around in the atmosphere forever – as much as possible over the past several years, voluntarily complying with the US Environmental Protection Act's target to reduce emissions of fluorinated gases by 10% by 2012.
Based on work at the Montserrat Volcano in the West Indies and other volcanoes, a new model suggests that the quakes could occur when slabs of highly viscous magma with low gas content stick momentarily and then slip past one another, producing the vibrations.
If you see a driver on the opposite direction starting an overtake or simply driving aggressively, lift-off of the gas and stick to the far right.
This has become a key area of development for F1 cars as they make use of the 'Coanda effect', which defines that gases will stick to a surface they flow alongside, to guide the exhausts gases downwards to the rear floor of the car to improve downforce.
