Sentences with phrase «constraints on coal»

«There are a number of companies that are promoting constraints on coal use to achieve greater profits and / or competitive advantages,» Murray said at the coal conference.

Not exact matches

In this series, we examine the role of coal as an energy source in a world where constraints on carbon emissions are adopted to mitigate global warming.

During that period, moreover, there were no constraints on the burning of coal whatsoever, thus no constraints on the production of the sort of aerosols currently claimed to have a cooling effect on the atmosphere strong enough to offset the effect of CO2 emission.

And for those of you who want to insist that aerosols produced by the uncontrolled burning of coal neutralized the effects of AGW from 1940 to 1979, please explain how the same argument could not be made for the effects of coal - induced aerosols during this earlier period, when no constraints on the polluting effects of coal combustion were present at all.

The grid operator testified that «wholesale energy prices and emissions will rise when extreme weather results in natural gas pipeline constraints — driving up the price of natural gas (and wholesale energy) and forcing New England to rely on oil - and coal - fired generation for multi-day (or multi-week) periods.»

At the same time, however, the minister acknowledged that making a significant dent into the level of carbon emissions produced by gas - fired power plants will not happen «overnight», and was even at pains to stress that his department will not be imposing the same emission constraints on them as have already been announced for coal - fired plants.

We assumed only that due to the biological and physical effects the ratio fabsorbed (t) / (total CO2 content of then air) is more or less constant, hence a simple response pulse response exp -LRB-- t / lifetime) is applied to the anthropic time series of coal, gas, oil and cement which have different delta13C As the isotopic signature of (CO2 natural)(t) is slowly decreasing because plants living days or centuries ago are now rotting and degassing and as molecules entered in the ocean decades ago are now in the upwellings after a slow migration along the equal density surface from the high latitudes where those surface are surfacing at depth zero, there are common sense constraints or bounds on the possible evolution of the delta13C of the natural out - gassed CO2 molecules.

Yet while the wording of this slogan implies the avoidance of choice, the Obama administration has consistently attempted to «pick winners» by means of its strong support for renewables and other advanced energy technologies in the 2009 stimulus, and with regulatory constraints on fossil energy, especially coal.

Nor the planet where renewable energy is growing rapidly and increasing constraints are being placed on the use of dirty fuels such as coal.