1. Clean coal
If there were an economically viable way of doing clean coal, it would have gone into production shortly after the optimistic reports in The New Scientist 20+ years ago. What we have is oil companies, who need to pump something down the hole to squeeze the oil out at historically rather fast rates, asking for subsidies which could otherwise fund genuinely clean energy sources.
Is just one of a portifolio of genuinely renewable energy sources. I like solar because it can be installed close to the point of use. I'd expect to need 3kW+ on each phase of the mains in every street, in countries with modest sunshine like here in the uk. In Africa, the income from such generators exceeds typical daily costs per person, so minimising long distance transmission also moves ownership of energy generastors to smallholders who might have a more sensible use for modest income than corporates have.
Whilst I am opposed to proliferation of too many windmills; built with money borrowed and left to rust in all the wrong places, I am highly in favour of some windmill building, especially where they are responsibly located and managed, and preferably share a 3-phase connection with farms, factories, villages, or with other generators such as village combined heat&power from biomass plus fossil gas, tidal and wave renewables, and solar power.
Does the total cost of the US DoD in the 1990's and the 1st Iraq Oil War get counted in estimating the subsidies which you all pay for to have cheaper-than-eqilibrium oil and gas ? I'd hope that subsidies for truly clean renewables achieve more with less.
5. Irreplaceable Fossil Fuels
It is true that nothing is better than petroleum for its power to weight ratio of fuel and engines apart from nuclear fuels, and I suppose that we'd not want everyone riding around in trucks which run on plutionium. For some tasks such as 100-1000km point to point travel, I'd prefer a decrease in the number of journeys made rather than an increase in borrowing to pay for big petroleum cars which are good at such jouneys. For 1 to 100km travel, trains are most efficient or small electric cars most flexible for point to point. I'd expect some of each. What we have at the moment is a lot of work being done to transport four heavy chairs and a fancy stereo more than 100 km, with batteries four to ten times bigger than are needed to move two people plus luggage 1 to 100km point to point. I wonder if the marketing department set the specification? They are the same people who thought that a premium Hummer was a good choice, which might suggest that we should not listen to them.
When there is a basic <0.8 tonne electric car on the market, that is when I'd consider buying one. Until then, we have only what we can figure out how to make.