The week in green numbers…

1 trillion: The US-dollar dent in coal mining revenues that IEA estimates suggest we will see, annually, under its “450 scenario,” where coal prices slump as rigorous climate policies “lead to a collapse in demand.”

59: The gigawatts of aging US coal-fired generation (on top of the 41.2GW already slated for closure) that could cost-effectively be replaced with natural gas, renewable energy or efficiency options, without impacting the grid, according to a Union of Concerned Scientist study released Tuesday.

523 billion: The US-dollar amount spent on global fossil fuel subsidies over 2011 – a 30 per cent year-on-year increase, according to the IEA’s World Energy Outlook 2012.

88 billion: The US-dollar amount spent on subsidies for renewable energy projects globally in 2011 – although the IEA estimates this spend will approach $240 billion in 2035.

5: The number of years that the IEA predicts we could delay the onset of “dangerous climate change” by ramping up global energy efficiency measures, including a $US11.8 trillion investment in efficiency technologies – an amount the Agency’s report says would be more than offset by the resulting $18 trillion boost to the world economy by 2035.

11: The percentage by which the UK’s energy use would be cut by 2020 with the introduction a raft of energy efficiency measures,  according to the UK government’s first national Energy Efficiency Strategy estimates – a saving of 196TWh of energy generation, which is the equivalent to output from 22 power stations.

66: The number of coal-seam gas wells AGL Energy hopes to drill in south-west Sydney under a proposal that is currently being considered by the NSW Planning Assessment Commission – the first major CSG plan to be assessed under new ”state significant development” planning rules.

200: The mandatory minimum distance, in metres, that is required to exist between a coal-seam gas well and an occupied dwelling in NSW.

2000: The mandatory distance, in metres, that is required to exist between a wind turbine and an occupied residence in Victoria – unless there is a written agreement with the relevant landowners – under the state’s recently amended planning laws.

583 billion: The cubic metres of water that was used to meet the world’s growing energy needs in 2010 – more than is discharged each year by India’s Ganges River.

900 million: The number of carbon permits whose sale the European Union has revealed it will delay, to curb an oversupply in the world’s biggest emissions market.